CH52337A
(en )
1911-11-16
Call counting device for telephone systems
CH55448A
(en )
1912-08-16
Call counting device for telephone systems
CH56245A
(en )
1912-10-16
Call counters for telephone stations
CH57659A
(en )
1913-03-01
Device for semi-automatic telephone systems
FR433256A
(en )
1911-12-29
Meters for telephone systems
AT65751B
(en )
1914-07-25
Circuit for semi-automatic telephone systems.
FR15212E
(en )
1912-05-22
Switch for telephone systems
CH59766A
(en )
1913-06-02
Telephone call counter system
FR414964A
(en )
1910-09-15
Telephone system
FR421902A
(en )
1911-03-08
Telephone system
FR422677A
(en )
1911-03-28
Telephone system
FR422937A
(en )
1911-04-03
Telephone system
CH57406A
(en )
1913-01-02
Call facility for telephone systems with several party lines
AT69059B
(en )
1915-06-10
Circuit arrangement for telephone systems.
AT71117B
(en )
1916-02-10
Circuit arrangement for telephone systems.
FR448218A
(en )
1913-01-25
Prepaid telephone system
CH54232A
(en )
1912-05-01
Automatic telephone dialer
FR454339A
(en )
1913-07-01
Telephone call counting system
FR449193A
(en )
1913-02-19
Prepaid telephone system
CH54231A
(en )
1912-05-01
Number switch for the subscriber stations of an automatic telephone system
FR14297E
(en )
1911-10-24
Automatic counting device for telephone calls
DK13495C
(en )
1910-08-08
Connection device for Telephone Dictation Systems.
CH67181A
(en )
1914-11-16
Selecteutr device for telephone systems
DK12932C
(en )
1910-02-07
Device for Registering the Length of Telephone Calls.
CH54933A
(en )
1912-07-01
Equipment for automatic or partially automatic telephone systems