DK48108C
(en )
1933-12-04
Device for Tuning Circuits for High Frequency Amplifiers and Radios.
DK47327C
(en )
1933-05-15
Device for Tuning Circuits for High Frequency Amplifiers and Radios.
CH201773A
(en )
1938-12-15
Amplifier for high frequency waves.
DK47674C
(en )
1933-08-21
Device for Volume Control for Radio Receivers and High Frequency Amplifiers.
DK57490C
(en )
1940-04-15
Device for Tuning Elements for Radio Receivers and Other High Frequency Amplifiers.
DK46253C
(en )
1932-09-26
Device for Transformers for Low Frequency Amplifiers.
DK48416C
(en )
1934-02-19
Device for Suppression of Background Noise in Radio Devices and High Frequency Amplifiers.
DK47713C
(en )
1933-09-04
Device for Volume Control for Radio Receivers and High Frequency Amplifiers.
DK56803C
(en )
1939-10-16
Device for Tuning Circuits in Radio Receivers and Other High Frequency Amplifiers.
DK43928C
(en )
1931-03-30
Connecting device for tuners for tuning coils in radios.
DK36310C
(en )
1926-08-02
Tuning device for radios and the like.
CA297549A
(en )
1930-02-18
Radio frequency amplifying apparatus
CA302517A
(en )
1930-07-29
Tuning apparatus for high frequency circuits
DK51135C
(en )
1936-01-13
Device for Radio Receivers and Other High Frequency Amplifiers for Selectivity Control.
DK46567C
(en )
1932-11-28
Device for Radio Receivers or other tunable High Frequency Amplifiers.
DK47475C
(en )
1933-06-26
Device for High Frequency Transformers.
CA299538A
(en )
1930-04-22
High frequency amplifier circuit
DK41742C
(en )
1930-03-03
Device for sockets or substrates for transformers, inductors and other similar apparatus parts for radio receivers and transmitters.
DK47657C
(en )
1933-08-21
Automatic volume control device for Radio Receivers and High Frequency Amplifiers.
CA297371A
(en )
1930-02-04
Radio-frequency amplifying circuit
DK45062C
(en )
1931-12-28
Device at stations for simultaneous transmission of audio and radio signals.
DK47173C
(en )
1933-04-03
High frequency amplifier with tuned coupled circuits.
DK41580C
(en )
1930-02-03
Device for radio transmitters and radio receivers.
CA302171A
(en )
1930-07-15
Radio frequency amplifier
CA306946A
(en )
1930-12-23
Radio frequency amplification