Name Size Creator Creation Date Labels Comment  
PDF File 1398266.pdf 476 kB Shaun Ewing Nov 29, 1921 00:00
  • No labels
US-1398266-A // Electrical indicating and measuring device // Hitchcock Harry W. // American Telephone & Telegraph
PDF File 1550658.pdf 476 kB Shaun Ewing Aug 25, 1925 00:00
  • No labels
US-1550658-A // Ringing circuits for multiplex signaling // Affel Herman A. // American Telephone & Telegraph
PDF File 1681221.pdf 475 kB Shaun Ewing Aug 21, 1928 00:00
  • No labels
US-1681221-A // Telephone-exchange system // Coggins Paul P. // American Telephone & Telegraph
PDF File 1548874.pdf 474 kB Shaun Ewing Aug 11, 1925 00:00
  • No labels
US-1548874-A // Telegraph signaling system // Fell John M. ; Pierce Ralph E. // American Telephone & Telegraph
PDF File 1735742.pdf 474 kB Shaun Ewing Nov 12, 1929 00:00
  • No labels
US-1735742-A // Wave filter // Fetter Charles H. // American Telephone & Telegraph
PDF File 1570772.pdf 474 kB Shaun Ewing Jan 26, 1926 00:00
  • No labels
US-1570772-A // Reduction of distortion in multiplex repeaters // Nyquist Harry // American Telephone & Telegraph
PDF File 1507178.pdf 474 kB Shaun Ewing Sept 02, 1924 00:00
  • No labels
US-1507178-A // Method of and means for reducing interference in transmission systems // Hitchcock Harry W. // American Telephone & Telegraph
PDF File 1723153.pdf 474 kB Shaun Ewing Aug 06, 1929 00:00
  • No labels
US-1723153-A // Telephone system // Green Irving W. // American Telephone & Telegraph
PDF File 1530548.pdf 473 kB Shaun Ewing Mar 24, 1925 00:00
  • No labels
US-1530548-A // Signaling // Espenschied Lloyd // American Telephone & Telegraph
PDF File 1624936.pdf 472 kB Shaun Ewing Apr 19, 1927 00:00
  • No labels
US-1624936-A // Telegraph system // Faries Charles Lee // American Telephone & Telegraph
PDF File 1756131.pdf 471 kB Shaun Ewing Apr 29, 1930 00:00
  • No labels
US-1756131-A // High-frequency-oscillation generator // Ohl Russell S. // American Telephone & Telegraph
PDF File 1758025.pdf 471 kB Shaun Ewing May 13, 1930 00:00
  • No labels
US-1758025-A // Pole planer // Bolin Carleton H. // American Telephone & Telegraph
PDF File 1458193.pdf 471 kB Shaun Ewing Jun 12, 1923 00:00
  • No labels
US-1458193-A // Multiple balancing arrangement for multiplex transmission // Osborne Harold S. // American Telephone & Telegraph
PDF File 1778077.pdf 471 kB Shaun Ewing Oct 14, 1930 00:00
  • No labels
US-1778077-A // Remote-control system // Holden William H. T. // American Telephone & Telegraph
PDF File 1675429.pdf 470 kB Shaun Ewing Jul 03, 1928 00:00
  • No labels
US-1675429-A // Reeling device // Schnee Henry E. // American Telephone & Telegraph
PDF File 1615252.pdf 470 kB Shaun Ewing Jan 25, 1927 00:00
  • No labels
US-1615252-A // Electrical wave filter // Zobel Otto J. // American Telephone & Telegraph
PDF File 1653738.pdf 470 kB Shaun Ewing Dec 27, 1927 00:00
  • No labels
US-1653738-A // Suppression of echoes and singing in four-wire circuits // Silent Harold C. // American Telephone & Telegraph
PDF File 1738000.pdf 469 kB Shaun Ewing Dec 03, 1929 00:00
  • No labels
US-1738000-A // Means for and method of volume control of transmission // Green Estill I. // American Telephone & Telegraph
PDF File 1394190.pdf 468 kB Shaun Ewing Oct 18, 1921 00:00
  • No labels
US-1394190-A // Testing system for four-wire circuits // Demarest Charles S. // American Telephone & Telegraph
PDF File 1439723.pdf 468 kB Shaun Ewing Dec 26, 1922 00:00
  • No labels
US-1439723-A // Numbering system for automatic telephone exchanges // Blauvelt William G. // American Telephone & Telegraph
  1. Prev
  2. 1
  3. …
  4. 31
  5. 32
  6. 33
  7. 34
  8. 35
  9. 36
  10. 37
  11. 38
  12. 39
  13. 40
  14. 41
  15. 42
  16. 43
  17. …
  18. 70
  19. Next