GB713674A
(en )
1954-08-18
Improvements in frequency converters
GB152365A
(https= )
US1732741A
(en )
1929-10-22
Duplex radio transmission system
CN218549897U
(zh )
2023-02-28
新型无线电子信号发射器
GB785538A
(en )
1957-10-30
Improvements in or relating to transistor circuits
US1996830A
(en )
1935-04-09
Amplifier
US3775698A
(en )
1973-11-27
A circuit for generating a high power rf signal having low am and fm noise components
US2247544A
(en )
1941-07-01
Apparatus and process for generating sinusoidal currents
US1978818A
(en )
1934-10-30
Frequency stabilization
US2419869A
(en )
1947-04-29
Oscillation generator
US1654977A
(en )
1928-01-03
kellogg
US1943730A
(en )
1934-01-16
Radio frequency short wave receiver
GB212563A
(en )
1924-10-09
Improved means for generating high frequency electric currents
GB354075A
(en )
1931-08-06
Improvements in or relating to high frequency oscillation generators
US2123874A
(en )
1938-07-19
Crystal oscillator receiving system
US1343562A
(en )
1920-06-15
Control means for vacuum-tube circuits
US1707945A
(en )
1929-04-02
Electromagnetic-wave receiving system
US1218195A
(en )
1917-03-06
System for transmitting communications.
GB148447A
(en )
1921-12-12
Improvements in thermionic tube electromagnetic wave generating arrangements
US1437021A
(en )
1922-11-28
Electron-discharge-device circuits
GB700240A
(en )
1953-11-25
Improvements in electric oscillation generating devices utilizing semiconductor amplifiers
US1545502A
(en )
1925-07-14
Radiotelephony
US1352589A
(en )
1920-09-14
Electrical transmission of intelligence
GB719980A
(en )
1954-12-08
Improvements in or relating to push-pull circuits for amplifying or generating radio-frequency oscillations
US1687896A
(en )
1928-10-16
Radio transmitting system