CH149577A
(en )
1931-09-15
Subscriber set for fully automatic telephone systems.
GR1382B
(en )
1926-12-31
(TELEPHONE) CALL MACHINES.
AT104322B
(en )
1926-10-11
Telephone.
CH116918A
(en )
1926-10-01
Counters for telephone systems.
AT109639B
(en )
1928-05-10
Impulse transmitter for subscriber stations in automatic telephone exchanges.
FR605788A
(en )
1926-06-01
Telephone conversation counter
AT103673B
(en )
1926-07-10
Telephone dialer.
DK46085C
(en )
1932-08-22
Circuit device for automatic telephone subscriber stations.
AT118954B
(en )
1930-09-10
Telephone dialer.
AT109102B
(en )
1928-03-26
Self-hooking telephone exchanges voters.
ES80637A1
(en )
1922-05-01
Telephone station with telephonograph.
CH112500A
(en )
1926-01-02
Telephone desk station.
AT99338B
(en )
1925-02-25
Telephone system for optional calls.
DK42778C
(en )
1930-08-18
Circuit arrangement for Private Telephone Centers with associated Private Subscriber Stations.
AT112301B
(en )
1929-02-25
Repeaters for telephone stations.
CH120657A
(en )
1927-08-01
Self-collecting telephone station.
DK35614C
(en )
1926-02-15
Automatic Dialer for Telephone exchanges.
DK33023C
(en )
1924-03-31
Telephone relay.
FR26042E
(en )
1923-07-18
Conversation telephone counter
AT113265B
(en )
1929-05-25
Circuit arrangement for fully automatic telephone exchanges.
AT109595B
(en )
1928-05-10
Telephone call transmitter.
ES94875A3
(en )
1925-12-16
A call mechanism for automatic telephone stations.
AT109111B
(en )
1928-03-26
Telephone.
AT105745B
(en )
1927-02-25
Automatic telephone switchboard.
ES91246A3
(en )
1924-12-01
A new telephone handset.