Name Size Creator Creation Date Labels Comment  
PDF File 1667804.pdf 270 kB Shaun Ewing May 01, 1928 00:00
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US-1667804-A // Means for reenforcing the lock and door of telephone coin collectors // Hoyt Frederick A. ; Shann Oscar A. // Bell Telephone Labor Inc
PDF File 1667830.pdf 1.59 MB Shaun Ewing May 01, 1928 00:00
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US-1667830-A // Telephone system // Ulrich Horace W. // Bell Telephone Labor Inc
PDF File 1667845.pdf 1.05 MB Shaun Ewing May 01, 1928 00:00
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US-1667845-A // Telephone system // Fowler Clarence B. ; Lucek Charles W. // Bell Telephone Labor Inc
PDF File 1667846.pdf 967 kB Shaun Ewing May 01, 1928 00:00
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US-1667846-A // Telephone system // Fowler Clarence B. // Bell Telephone Labor Inc
PDF File 1668654.pdf 337 kB Shaun Ewing May 08, 1928 00:00
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US-1668654-A // Direct-current-transforming apparatus // Moore Charles B. // Bell Telephone Labor Inc
PDF File 1668656.pdf 346 kB Shaun Ewing May 08, 1928 00:00
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US-1668656-A // Relay circuit // Phelps Walter Alfred // Bell Telephones Lab Inc
PDF File 1668677.pdf 242 kB Shaun Ewing May 08, 1928 00:00
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US-1668677-A // Telephone-exchange system // Harvey William H. // Bell Telephone Labor Inc
PDF File 1668888.pdf 898 kB Shaun Ewing May 08, 1928 00:00
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US-1668888-A // Signaling system // Buckley Oliver E. // Bell Telephone Labor Inc
PDF File 1668890.pdf 225 kB Shaun Ewing May 08, 1928 00:00
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US-1668890-A // Universal adjustable earpiece for audiphones // Curran Stanley T. ; Jr. Emil C. Mueller, // Bell Telephone Labor Inc
PDF File 1670461.pdf 899 kB Shaun Ewing May 22, 1928 00:00
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US-1670461-A // Signaling system // Locke George A. // Bell Telephone Labor Inc
PDF File 1671302.pdf 769 kB Shaun Ewing May 29, 1928 00:00
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US-1671302-A // Electrooptical transmission // Mathes Robert C. // Bell Telephone Labor Inc
PDF File 1673005.pdf 277 kB Shaun Ewing Jun 12, 1928 00:00
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US-1673005-A // Condenser // Gargan John O. // Bell Telephone Labor Inc
PDF File 1673015.pdf 356 kB Shaun Ewing Jun 12, 1928 00:00
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US-1673015-A // Switching system // Murphy Paul B. // Bell Telephone Labor Inc
PDF File 1673023.pdf 421 kB Shaun Ewing Jun 12, 1928 00:00
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US-1673023-A // Carrier-wave repeater // Rettenmeyer Francis X. // Bell Telephone Labor Inc
PDF File 1673031.pdf 459 kB Shaun Ewing Jun 12, 1928 00:00
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US-1673031-A // Wave transmission system // Whiting Donald F. // Bell Telephone Labor Inc
PDF File 1673034.pdf 319 kB Shaun Ewing Jun 12, 1928 00:00
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US-1673034-A // Connecter // Jr. William J. Adams, // Bell Telephone Labor Inc
PDF File 1673037.pdf 309 kB Shaun Ewing Jun 12, 1928 00:00
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US-1673037-A // Sound measuring // Blattner David G. // Bell Telephone Labor Inc
PDF File 1673042.pdf 1004 kB Shaun Ewing Jun 12, 1928 00:00
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US-1673042-A // Signaling system // Curtis Austen M. // Bell Telephone Labor Inc
PDF File 1673124.pdf 252 kB Shaun Ewing Jun 12, 1928 00:00
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US-1673124-A // Signaling system // Raynsford Arthur // Bell Telephone Labor Inc
PDF File 1673828.pdf 350 kB Shaun Ewing Jun 19, 1928 00:00
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US-1673828-A // Television // Ives Herbert E. // Bell Telephone Labor Inc
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