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Attachments
| Name | Size | Creator | Creation Date | Labels | Comment | |||
|---|---|---|---|---|---|---|---|---|
| PDF File 1778386.pdf | 432 kB | Shaun Ewing | Oct 14, 1930 00:00 |
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US-1778386-A // Sound reproducer // Harrison Henry C. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 432 kB | Shaun Ewing | Oct 14, 1930 00:00 | US-1778386-A // Sound reproducer // Harrison Henry C. // Bell Telephone Labor Inc | ||||
| PDF File 1778401.pdf | 281 kB | Shaun Ewing | Oct 14, 1930 00:00 |
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US-1778401-A // Relay // Pratt Edward J. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 281 kB | Shaun Ewing | Oct 14, 1930 00:00 | US-1778401-A // Relay // Pratt Edward J. // Bell Telephone Labor Inc | ||||
| PDF File 1778407.pdf | 1001 kB | Shaun Ewing | Oct 14, 1930 00:00 |
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US-1778407-A // Selective switch // Walters James N. ; Clark Edgar H. // American Telephone & Telegraph ; Bell Telephone Labor Inc | |||
| Version 1 (current) | 1001 kB | Shaun Ewing | Oct 14, 1930 00:00 | US-1778407-A // Selective switch // Walters James N. ; Clark Edgar H. // American Telephone & Telegraph ; Bell Telephone Labor Inc | ||||
| PDF File 1778750.pdf | 492 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1778750-A // Transmission regulation // Bruce Edmond // Bell Telephone Labor Inc | |||
| Version 1 (current) | 492 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1778750-A // Transmission regulation // Bruce Edmond // Bell Telephone Labor Inc | ||||
| PDF File 1778751.pdf | 294 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1778751-A // Control of electrical variations // Buckley Oliver E. ; Johnson John B. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 294 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1778751-A // Control of electrical variations // Buckley Oliver E. ; Johnson John B. // Bell Telephone Labor Inc | ||||
| PDF File 1778756.pdf | 407 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1778756-A // Coupling device // Elmer Lloyd A. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 407 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1778756-A // Coupling device // Elmer Lloyd A. // Bell Telephone Labor Inc | ||||
| PDF File 1778759.pdf | 298 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1778759-A // Submarine signaling // Gilbert John J. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 298 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1778759-A // Submarine signaling // Gilbert John J. // Bell Telephone Labor Inc | ||||
| PDF File 1778768.pdf | 613 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1778768-A // Telephone-ringing system // Norton Philander // Bell Telephone Labor Inc | |||
| Version 1 (current) | 613 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1778768-A // Telephone-ringing system // Norton Philander // Bell Telephone Labor Inc | ||||
| PDF File 1778779.pdf | 506 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1778779-A // Control circuit for transmission systems // Whiting Donald F. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 506 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1778779-A // Control circuit for transmission systems // Whiting Donald F. // Bell Telephone Labor Inc | ||||
| PDF File 1778871.pdf | 665 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1778871-A // Acoustic device // Smythe Edwin H. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 665 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1778871-A // Acoustic device // Smythe Edwin H. // Bell Telephone Labor Inc | ||||
| PDF File 1778894.pdf | 287 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1778894-A // Relay // Fry Jacob R. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 287 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1778894-A // Relay // Fry Jacob R. // Bell Telephone Labor Inc | ||||
| PDF File 1779058.pdf | 386 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1779058-A // Telephone switchboard // Borgmann Charles ; Marting Heber E. ; Hagland Harvey M. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 386 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1779058-A // Telephone switchboard // Borgmann Charles ; Marting Heber E. ; Hagland Harvey M. // Bell Telephone Labor Inc | ||||
| PDF File 1779126.pdf | 504 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1779126-A // Negative resistance circuits // Graham Frank Howard // Bell Telephone Labor Inc | |||
| Version 1 (current) | 504 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1779126-A // Negative resistance circuits // Graham Frank Howard // Bell Telephone Labor Inc | ||||
| PDF File 1779380.pdf | 712 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1779380-A // Negative impedance circuits // Dudley Homer W. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 712 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1779380-A // Negative impedance circuits // Dudley Homer W. // Bell Telephone Labor Inc | ||||
| PDF File 1779382.pdf | 542 kB | Shaun Ewing | Oct 21, 1930 00:00 |
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US-1779382-A // Negative impedance circuit // Mathes Robert C. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 542 kB | Shaun Ewing | Oct 21, 1930 00:00 | US-1779382-A // Negative impedance circuit // Mathes Robert C. // Bell Telephone Labor Inc | ||||
| PDF File 1780906.pdf | 4.09 MB | Shaun Ewing | Nov 11, 1930 00:00 |
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US-1780906-A // Automatic toll-switching telephone system // Carpenter Warren W. ; Hersey Ralph E. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 4.09 MB | Shaun Ewing | Nov 11, 1930 00:00 | US-1780906-A // Automatic toll-switching telephone system // Carpenter Warren W. ; Hersey Ralph E. // Bell Telephone Labor Inc | ||||
| PDF File 1780910.pdf | 1.87 MB | Shaun Ewing | Nov 11, 1930 00:00 |
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US-1780910-A // Testing system // Dunham Bert G. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 1.87 MB | Shaun Ewing | Nov 11, 1930 00:00 | US-1780910-A // Testing system // Dunham Bert G. // Bell Telephone Labor Inc | ||||
| PDF File 1780917.pdf | 239 kB | Shaun Ewing | Nov 11, 1930 00:00 |
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US-1780917-A // Electric condenser // Hoch Ellery T. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 239 kB | Shaun Ewing | Nov 11, 1930 00:00 | US-1780917-A // Electric condenser // Hoch Ellery T. // Bell Telephone Labor Inc | ||||
| PDF File 1780919.pdf | 327 kB | Shaun Ewing | Nov 11, 1930 00:00 |
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US-1780919-A // Means for recording telephone conversations // Holland Charlotte M. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 327 kB | Shaun Ewing | Nov 11, 1930 00:00 | US-1780919-A // Means for recording telephone conversations // Holland Charlotte M. // Bell Telephone Labor Inc | ||||
| PDF File 1780921.pdf | 568 kB | Shaun Ewing | Nov 11, 1930 00:00 |
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US-1780921-A // Communication system // Horton Joseph W. // Bell Telephone Labor Inc | |||
| Version 1 (current) | 568 kB | Shaun Ewing | Nov 11, 1930 00:00 | US-1780921-A // Communication system // Horton Joseph W. // Bell Telephone Labor Inc |
