AU151323B2
(en )
1951-01-25
Improvements in loud-speaking telephone equipment
AU3821250A
(en )
1951-01-25
Improvements in loud-speaking telephone equipment
CA468513A
(en )
1950-10-03
Telephone hand sets
AU152592B2
(en )
1950-07-27
Improvements in routining equipment orthe like as used in telephone systems
AU142850B2
(en )
1948-01-15
Improvements in loud-speaking telephone arrangements
AU3455150A
(en )
1950-07-27
Improvements in routining equipment orthe like as used in telephone systems
AU150101B2
(en )
1950-12-14
Improvements in subscribers' telephone sets
CA463075A
(en )
1950-02-07
Telephone circuit
CA464939A
(en )
1950-05-09
Telephone index
AU150491B2
(en )
1950-11-23
Improvements in telephone intercommunication amplifier equipment
AU1672047A
(en )
1948-01-15
Improvements in loud-speaking telephone arrangements
CA463923A
(en )
1950-03-21
Telephone call transmitter
AU154451B2
(en )
Improvements in or relating to telephone subscriber sets
AU155518B2
(en )
1951-11-08
Improvements in cables for use in telephony
AU3744050A
(en )
1950-12-14
Improvements in subscribers' telephone sets
CA462640A
(en )
1950-01-24
Telephone system
CA462890A
(en )
1950-01-31
Telephone system
CA465294A
(en )
1950-05-23
Telephone system
CA468566A
(en )
1950-10-03
Telephone call transmitters
AU228460B2
(en )
1958-08-28
Improvements in or relating to loudspeaking telephone instruments
CA468260A
(en )
1950-09-19
Telephone instruments
CA462927A
(en )
1950-01-31
Loudspeaking communication system
AU3113249A
(en )
1950-11-23
Improvements in telephone intercommunication amplifier equipment
CA464883A
(en )
1950-05-02
Voice-controlled two-way telephone set
CA464882A
(en )
1950-05-02
Dial telephone calling device