|
US4757500A
|
|
Method for zero byte time slot interchange
|
|
US4657423A
|
|
Fastener and receptacle arrangement for perpendicularly connecting pieces of flat stock material
|
|
US4609126A
|
|
Venting cap for apparatus housing
|
|
US4648007A
|
|
Cooling module for electronic equipment
|
|
US4647723A
|
|
Circuit for detection of off-hook condition of extension telephones
|
|
US4598266A
|
|
Modulo adder
|
|
US4518829A
|
|
Two terminal microphone active load gain regulation circuit
|
|
US4614842A
|
|
Secretarial telephone station with distributed processing for use with a secretarial answering system
|
|
US4494093A
|
|
Lockable tuning mechanism with reduced backlash
|
|
US4507625A
|
|
Switched capacitor AM modulator/demodulator
|
