CH71402A
(en )
1916-01-03
Equipment for telephone stations for automatic phonographic answering and recording of calls
CH65635A
(en )
1914-07-01
Equipment on telephones for phonographic recording of the conversation between the calling party and the called party
DK22260C
(en )
1917-07-16
Device for Telephones for Automatic Phonographic Answering and Recording of the Telephoned Message.
FR20952E
(en )
1920-02-05
Improvement in tape recorders for telephone calls
FR480964A
(en )
1916-10-19
Improvement in tape recorders for telephone calls
CH78729A
(en )
1918-09-02
Device for the phonographic recording and reproduction of conversations transmitted by telephone
CH77170A
(en )
1918-03-16
Device on telephones for phonographic recording of the conversation between the calling party and the person being called
CH54232A
(en )
1912-05-01
Automatic telephone dialer
DK16830C
(en )
1912-12-30
Apparatus for Phonographic Recording of Phone Calls.
AT81494B
(en )
1920-10-11
Device for phonographical recording and replay Device for phonographical recording and playback of conversations transmitted by telephone. results of conversations transmitted by telephone.
CA161182A
(en )
1915-03-09
Telephone call recorder
AU112511B
(en )
1912-05-21
Improved means of and apparatus for recording calls made by telephone
FR479649A
(en )
1916-04-19
Advanced recording of automatic telephone calls
CH68408A
(en )
1915-03-16
Reservation board for telephone station numbers and methods of producing the same
FR469098A
(en )
1914-07-23
Phone call recorder
DK17471C
(en )
1913-06-30
Apparatus for Phonographic Recording of Phone Calls.
FR485708A
(en )
1918-02-01
Improvements in recording methods for telephone calls
CH65029A
(en )
1914-05-16
Telephone playback apparatus
FR437442A
(en )
1912-04-20
Device for phonographic reproduction of telephone conversations
CH59025A
(en )
1913-04-16
Telephone system dialers
CH60213A
(en )
1913-07-01
Loudspeaker telephone
CA161631A
(en )
1915-03-30
Telephone call recorder
CH80148A
(en )
1919-02-01
Handset for telephones and microphones
CH57406A
(en )
1913-01-02
Call facility for telephone systems with several party lines
FR20153E
(en )
1917-01-25
Improvement in the recording of calls in automatic telephony