|
US2478395A
(en)
*
|
1943-03-05 |
1949-08-09 |
Automatic Elect Lab |
Automatic by-pass for repeaters
|
|
US2552787A
(en)
*
|
1946-11-23 |
1951-05-15 |
Automatic Elect Lab |
Channel switching in voice current repeater stations
|
|
GB653966A
(en)
*
|
1948-07-13 |
1951-05-30 |
Standard Telephones Cables Ltd |
Improvements in or relating to the automatic replacement of defectiye repeating or receiving equipment in high frequency electric communication systems
|
|
US2592716A
(en)
*
|
1949-03-25 |
1952-04-15 |
Bell Telephone Labor Inc |
Self-correcting amplifier
|
|
US2773944A
(en)
*
|
1950-08-08 |
1956-12-11 |
Bendix Aviat Corp |
Amplifying system with stand-by channel
|
|
US2625613A
(en)
*
|
1950-10-04 |
1953-01-13 |
Maico Company Inc |
Tone interrupter for audiometers
|
|
US2686256A
(en)
*
|
1951-02-06 |
1954-08-10 |
Bell Telephone Labor Inc |
Signal transmission system
|
|
US2663010A
(en)
*
|
1952-02-01 |
1953-12-15 |
Itt |
Switching system
|
|
BE527208A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
*
|
1953-03-28 |
|
|
|
|
US2802990A
(en)
*
|
1953-08-04 |
1957-08-13 |
Ericsson Telefon Ab L M |
Switching system in multiple line multiplex transmission system
|
|
DE954796C
(de)
*
|
1954-09-25 |
1956-12-20 |
Siemens Ag |
UEbertragungsanlage mit Breitbandkabel mit koaxialen Leitern
|
|
US3009133A
(en)
*
|
1956-06-25 |
1961-11-14 |
Westinghouse Air Brake Co |
Automatic changeover for carrier circuits
|
|
US3111624A
(en)
*
|
1960-01-04 |
1963-11-19 |
Bell Telephone Labor Inc |
Automatic system for selectively substituting spare channels for failed working channels in a multichannel multilink communication system
|
|
NL260534A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
*
|
1960-02-10 |
|
|
|
|
US3170071A
(en)
*
|
1960-03-30 |
1965-02-16 |
Ibm |
Error correction device utilizing spare substitution
|
|
NL267532A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
*
|
1960-07-29 |
|
|
|
|
US3138781A
(en)
*
|
1960-12-21 |
1964-06-23 |
Westinghouse Brake & Signal |
Electronic drive circuits for remote control systems
|
|
US3202941A
(en)
*
|
1960-12-23 |
1965-08-24 |
Bell Telephone Labor Inc |
High frequency channel switching unit, employing electromechanical contact means
|
|
US3248693A
(en)
*
|
1961-09-25 |
1966-04-26 |
Bell Telephone Labor Inc |
Data transmission system for operation in signal environment with a high noise level
|
|
US3204204A
(en)
*
|
1962-09-26 |
1965-08-31 |
Automatic Elect Lab |
Fast-switching arrangement for the transfer of communication channels
|
|
NL6408627A
(nl)
*
|
1964-07-29 |
1966-01-31 |
Philips Nv |
Transmissie-inrichting
|
|
US3451042A
(en)
*
|
1964-10-14 |
1969-06-17 |
Westinghouse Electric Corp |
Redundant signal transmission system
|
|
US3319088A
(en)
*
|
1964-11-25 |
1967-05-09 |
John B Payne |
Selective delay device
|
|
NL6507233A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
*
|
1965-06-05 |
1966-12-06 |
|
|
|
US3403357A
(en)
*
|
1966-04-14 |
1968-09-24 |
Hughes Aircraft Co |
Switching apparatus for selectively coupling a predetermined number of microwave devices between an input and an output port
|
|
US3519945A
(en)
*
|
1967-09-05 |
1970-07-07 |
Bell Telephone Labor Inc |
System for replacing all or part of a faulty amplifier
|
|
US3868584A
(en)
*
|
1971-02-08 |
1975-02-25 |
Henry Richard Beurrier |
Amplifier with input and output match
|
|
US4264894A
(en)
*
|
1979-06-18 |
1981-04-28 |
Ellington Stephen P |
Fault bypass for data transmission system
|
|
FR2511772A1
(fr)
*
|
1981-08-24 |
1983-02-25 |
Inst Francais Du Petrole |
Dispositif de transmission sequentielle de signaux par radio ou par cable, entre un systeme central de commande et des appareils d'acquisition de donnees
|
|
US4565972A
(en)
*
|
1985-03-18 |
1986-01-21 |
Tx Rx Systems, Inc. |
Tower mounted preamplifier
|
|
US5418490A
(en)
*
|
1994-03-01 |
1995-05-23 |
Tx Rx Systems, Inc. |
Failure responsive alternate amplifier and bypass system for communications amplifier
|