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Attachments
| Name | Size | Creator | Creation Date | Labels | Comment | |||
|---|---|---|---|---|---|---|---|---|
| PDF File 2159595.pdf | 1.86 MB | Shaun Ewing | May 23, 1939 00:00 |
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US-2159595-A // Frequency conversion circuits // Miller Ralph L. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 1.86 MB | Shaun Ewing | May 23, 1939 00:00 | US-2159595-A // Frequency conversion circuits // Miller Ralph L. // Bell Telephone Labor Inc | ||||
| PDF File 2159020.pdf | 565 kB | Shaun Ewing | May 23, 1939 00:00 |
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US-2159020-A // Modulating system // Ferrell Enoch B. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 565 kB | Shaun Ewing | May 23, 1939 00:00 | US-2159020-A // Modulating system // Ferrell Enoch B. // Bell Telephone Labor Inc | ||||
| PDF File 2158993.pdf | 1.10 MB | Shaun Ewing | May 23, 1939 00:00 |
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US-2158993-A // Signal transmission system // Abraham Leonard G. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 1.10 MB | Shaun Ewing | May 23, 1939 00:00 | US-2158993-A // Signal transmission system // Abraham Leonard G. // Bell Telephone Labor Inc | ||||
| PDF File 2158516.pdf | 384 kB | Shaun Ewing | May 16, 1939 00:00 |
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US-2158516-A // Protective device for electrical apparatus // Meintash Frank H. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 384 kB | Shaun Ewing | May 16, 1939 00:00 | US-2158516-A // Protective device for electrical apparatus // Meintash Frank H. // Bell Telephone Labor Inc | ||||
| PDF File 2158492.pdf | 1.02 MB | Shaun Ewing | May 16, 1939 00:00 |
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US-2158492-A // Undersea cable system // Bishop Walter M. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 1.02 MB | Shaun Ewing | May 16, 1939 00:00 | US-2158492-A // Undersea cable system // Bishop Walter M. // Bell Telephone Labor Inc | ||||
| PDF File 2158132.pdf | 480 kB | Shaun Ewing | May 16, 1939 00:00 |
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US-2158132-A // Magnet body and process of making the same // Legg Victor E. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 480 kB | Shaun Ewing | May 16, 1939 00:00 | US-2158132-A // Magnet body and process of making the same // Legg Victor E. // Bell Telephone Labor Inc | ||||
| PDF File 2158113.pdf | 1.65 MB | Shaun Ewing | May 16, 1939 00:00 |
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US-2158113-A // Teletypewriter trunking system // Fitch Karl F. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 1.65 MB | Shaun Ewing | May 16, 1939 00:00 | US-2158113-A // Teletypewriter trunking system // Fitch Karl F. // Bell Telephone Labor Inc | ||||
| PDF File 2157890.pdf | 442 kB | Shaun Ewing | May 09, 1939 00:00 |
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US-2157890-A // Switching device // Dehn Joseph W. ; Myers Oscar // Bell Telephone Labor Inc | |||
| Version 1 (current) | 442 kB | Shaun Ewing | May 09, 1939 00:00 | US-2157890-A // Switching device // Dehn Joseph W. ; Myers Oscar // Bell Telephone Labor Inc | ||||
| PDF File 2157870.pdf | 666 kB | Shaun Ewing | May 09, 1939 00:00 |
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US-2157870-A // High frequency circuit and apparatus // Sowers Nelson E. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 666 kB | Shaun Ewing | May 09, 1939 00:00 | US-2157870-A // High frequency circuit and apparatus // Sowers Nelson E. // Bell Telephone Labor Inc | ||||
| PDF File 2157703.pdf | 696 kB | Shaun Ewing | May 09, 1939 00:00 |
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US-2157703-A // Piezoelectric apparatus // Hovgaard Ole M. ; Koerner Lawrence F. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 696 kB | Shaun Ewing | May 09, 1939 00:00 | US-2157703-A // Piezoelectric apparatus // Hovgaard Ole M. ; Koerner Lawrence F. // Bell Telephone Labor Inc | ||||
| PDF File 2157694.pdf | 784 kB | Shaun Ewing | May 09, 1939 00:00 |
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US-2157694-A // Transmission level control // Fisher Harold J. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 784 kB | Shaun Ewing | May 09, 1939 00:00 | US-2157694-A // Transmission level control // Fisher Harold J. // Bell Telephone Labor Inc | ||||
| PDF File 2157336.pdf | 924 kB | Shaun Ewing | May 09, 1939 00:00 |
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US-2157336-A // Electron discharge apparatus // Heising Raymond A. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 924 kB | Shaun Ewing | May 09, 1939 00:00 | US-2157336-A // Electron discharge apparatus // Heising Raymond A. // Bell Telephone Labor Inc | ||||
| PDF File 2157326.pdf | 1.07 MB | Shaun Ewing | May 09, 1939 00:00 |
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US-2157326-A // Signal transmission system // Jr. Stephen Doba, // Bell Telephone Labor Inc | |||
| Version 1 (current) | 1.07 MB | Shaun Ewing | May 09, 1939 00:00 | US-2157326-A // Signal transmission system // Jr. Stephen Doba, // Bell Telephone Labor Inc | ||||
| PDF File 2156754.pdf | 453 kB | Shaun Ewing | May 02, 1939 00:00 |
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US-2156754-A // Telephone hand-set // Evans William A. ; Werring Walter W. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 453 kB | Shaun Ewing | May 02, 1939 00:00 | US-2156754-A // Telephone hand-set // Evans William A. ; Werring Walter W. // Bell Telephone Labor Inc | ||||
| PDF File 2156630.pdf | 547 kB | Shaun Ewing | May 02, 1939 00:00 |
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US-2156630-A // Timing circuits // Knowlton Clarence S. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 547 kB | Shaun Ewing | May 02, 1939 00:00 | US-2156630-A // Timing circuits // Knowlton Clarence S. // Bell Telephone Labor Inc | ||||
| PDF File 2156622.pdf | 1.32 MB | Shaun Ewing | May 02, 1939 00:00 |
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US-2156622-A // Signal transmission system // Jr. Stephen Doba, // Bell Telephone Labor Inc | |||
| Version 1 (current) | 1.32 MB | Shaun Ewing | May 02, 1939 00:00 | US-2156622-A // Signal transmission system // Jr. Stephen Doba, // Bell Telephone Labor Inc | ||||
| PDF File 2156088.pdf | 1.44 MB | Shaun Ewing | Apr 25, 1939 00:00 |
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US-2156088-A // Multielement electron discharge apparatus and system // Heising Raymond A. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 1.44 MB | Shaun Ewing | Apr 25, 1939 00:00 | US-2156088-A // Multielement electron discharge apparatus and system // Heising Raymond A. // Bell Telephone Labor Inc | ||||
| PDF File 2156064.pdf | 581 kB | Shaun Ewing | Apr 25, 1939 00:00 |
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US-2156064-A // Electronic discharge device // Ronci Victor L. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 581 kB | Shaun Ewing | Apr 25, 1939 00:00 | US-2156064-A // Electronic discharge device // Ronci Victor L. // Bell Telephone Labor Inc | ||||
| PDF File 2155696.pdf | 618 kB | Shaun Ewing | Apr 25, 1939 00:00 |
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US-2155696-A // Measuring circuit // Vaughan Henry E. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 618 kB | Shaun Ewing | Apr 25, 1939 00:00 | US-2155696-A // Measuring circuit // Vaughan Henry E. // Bell Telephone Labor Inc | ||||
| PDF File 2155650.pdf | 388 kB | Shaun Ewing | Apr 25, 1939 00:00 |
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US-2155650-A // Housing for repeater apparatus // Gilbert John J. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 388 kB | Shaun Ewing | Apr 25, 1939 00:00 | US-2155650-A // Housing for repeater apparatus // Gilbert John J. // Bell Telephone Labor Inc |
