GB487708A
(en )
1938-06-24
Improvements in or relating to aerial and feeder systems
GB464443A
(en )
1937-04-19
Improvements in or relating to aerial systems
BE447791A
(OSRAM )
US2187014A
(en )
1940-01-16
Antenna transformer
GB528179A
(en )
1940-10-24
Improvements in or relating to thermionic valve amplifiers
GB436012A
(en )
1935-10-03
Improvements in or relating to high frequency transmission systems
US1895071A
(en )
1933-01-24
Dynamic loud speaker unit
GB581972A
(en )
1946-10-31
Improvements in or relating to concentric line impedance transformers
GB344444A
(en )
1931-02-27
An improved distributor for use in telegraphy or the like
US2226688A
(en )
1940-12-31
Wave transmission system
US3437947A
(en )
1969-04-08
Signal amplifier having grounded-base stage for a cable terminating impedance
US1027494A
(en )
1912-05-28
Telephone-receiver.
US1639727A
(en )
1927-08-23
Aerial
SU76555A3
(ru )
1948-11-30
Устройство дл соединени концентрического фидера с двум возбуждаемыми в противоположных фазах симметричными концентрическими лини ми
GB630010A
(en )
1949-10-04
Centre fed antenna
US1579605A
(en )
1926-04-06
Radio amplifying receiver
USD59840S
(en )
1921-11-29
Design for an attachment-plug or connector
BE449657A
(OSRAM )
1943-04-30
CH99628A
(fr )
1923-06-16
Installation téléphonique comprenant un dispositif amplificateur des courants devant être transmis sur une ligne interurbaine.
GB469245A
(en )
1937-07-21
Improvements in or relating to wireless aerial systems
SU414639A1
(OSRAM )
1974-02-05
USD115449S
(en )
1939-06-27
Design for a signal device
US274352A
(en )
1883-03-20
Receiving-telephone
US1977125A
(en )
1934-10-16
Transmission of electrical impulses by radio
USD67608S
(en )
1925-06-16
Design for a loud-speaking telephone receiver