CH258725A - Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr. - Google Patents
Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr.Info
- Publication number
- CH258725A CH258725A CH258725DA CH258725A CH 258725 A CH258725 A CH 258725A CH 258725D A CH258725D A CH 258725DA CH 258725 A CH258725 A CH 258725A
- Authority
- CH
- Switzerland
- Prior art keywords
- connection telephone
- noisy
- switchable self
- traffic
- remote switchable
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH597893X | 1942-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH258725A true CH258725A (de) | 1948-12-15 |
Family
ID=4522563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH258725D CH258725A (de) | 1942-12-21 | 1942-12-21 | Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr. |
Country Status (3)
Country | Link |
---|---|
US (1) | US2470590A (de) |
CH (1) | CH258725A (de) |
GB (1) | GB597893A (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3215781A (en) * | 1962-07-30 | 1965-11-02 | Webster Electric Co Inc | Intercommunication system |
US6091812A (en) * | 1996-11-12 | 2000-07-18 | Siemens Information And Communication Networks, Inc. | Apparatus and method for automatically switching a headset between a telephone and a second audio source |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1486868A (en) * | 1920-05-27 | 1924-03-18 | Western Electric Co | Intercommunicating telephone system |
US1647606A (en) * | 1925-11-28 | 1927-11-01 | J S Timmons Inc | Intercommunication system |
US2036023A (en) * | 1933-06-09 | 1936-03-31 | Bell Telephone Labor Inc | Telephone system |
FR789510A (fr) * | 1933-12-30 | 1935-10-30 | Le Telephone Prive Nat | Perfectionnements à la téléphonie |
US2146362A (en) * | 1936-10-01 | 1939-02-07 | Lcuis W Thomsen | Two-way communication system |
US2162370A (en) * | 1937-07-19 | 1939-06-13 | Webster Electric Co Inc | Communication system |
GB508031A (en) * | 1937-12-23 | 1939-06-23 | Automatic Telephone & Elect | Improvements in or relating to telephone systems |
GB522457A (en) * | 1938-12-02 | 1940-06-18 | Marcello Creti | Improvements in or relating to systems of simultaneous telephony on a number of lines |
-
1942
- 1942-12-21 CH CH258725D patent/CH258725A/de unknown
-
1944
- 1944-05-12 US US535299A patent/US2470590A/en not_active Expired - Lifetime
-
1945
- 1945-03-08 GB GB5809/45A patent/GB597893A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2470590A (en) | 1949-05-17 |
GB597893A (en) | 1948-02-05 |
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