GB536066A
(en )
1941-05-01
Improvements in or relating to electro-acoustic apparatus
GB1504065A
(en )
1978-03-15
Headphone
GB1085145A
(en )
1967-09-27
Sound transducer
SE310001B
(
1969-04-14
GB961369A
(en )
1964-06-17
Improvements in electro-acoustic transducer which is incorporated in a capsule and comprises a transistor amplifier particularly for telephone handsets
USD199125S
(en )
1964-09-15
Ear supported telephone operator s
headset, or similar article
GB869234A
(en )
1961-05-31
Transducer and vibratory diaphragm
GB1139718A
(en )
1969-01-15
Improvements in or relating to telephone headsets
GB513529A
(en )
1939-10-16
Improvements in or relating to telephone transmitters
GB836959A
(en )
1960-06-09
Small-size condenser microphone
JPS5330803A
(en )
1978-03-23
Voice communication system
GB829214A
(en )
1960-03-02
Improvements in loud speaker systems
JPS51151122A
(en )
1976-12-25
Speaker unit
GB793546A
(en )
1958-04-16
Improvements in or relating to microphones
USD135401S
(en )
1943-03-30
Design for a loud-speaking
telephone
JPS5392120A
(en )
1978-08-12
Method of mounting directional microphone
USD182498S
(en )
1958-04-15
Telephone stand
USD203994S
(en )
1966-03-08
Telephone handset
USD135495S
(en )
1943-04-13
Design for a loud-speaking tele-
phone set
USD77797S
(en )
1929-02-19
Design for a radio loud-speaker or the like
GB661887A
(en )
1951-11-28
Improvements in or relating to mounting for loudspeakers
GB973479A
(en )
1964-10-28
Improvements in hearing aids
GB934995A
(en )
1963-08-21
Improvements in loudspeakers
GB622828A
(en )
1949-05-09
Improvements in or relating to loudspeakers and like electro-acoustic transducers
GB847954A
(en )
1960-09-14
Improvements in or relating to loudspeaker cabinets
