GB514905A - Improvements in or relating to telephone instruments - Google Patents
Improvements in or relating to telephone instrumentsInfo
- Publication number
- GB514905A GB514905A GB14835/38A GB1483538A GB514905A GB 514905 A GB514905 A GB 514905A GB 14835/38 A GB14835/38 A GB 14835/38A GB 1483538 A GB1483538 A GB 1483538A GB 514905 A GB514905 A GB 514905A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relating
- telephone
- telephone instruments
- hand
- microphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Abstract
514,905. Telephone sets. POLLAK, J. E. (Associated Telephone & Telegraph Co.). May 18, 1938, No. 14835. [Class 40 (iv)] . A telephone hand-set is provided with a socket whereby a throat-operated microphone 6 may be plugged in and supported on the hand set in addition to the ordinary microphone 2, which may be automatically disconnected.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB219316X | 1938-05-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB514905A true GB514905A (en) | 1939-11-21 |
Family
ID=10171212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB14835/38A Expired GB514905A (en) | 1938-05-18 | 1938-05-18 | Improvements in or relating to telephone instruments |
Country Status (5)
Country | Link |
---|---|
US (1) | US2245835A (en) |
BE (1) | BE434077A (en) |
CH (1) | CH219316A (en) |
FR (1) | FR854285A (en) |
GB (1) | GB514905A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2624808A (en) * | 1949-03-30 | 1953-01-06 | Nat Pneumatic Co Inc | Signaling switch device |
US3277243A (en) * | 1962-12-19 | 1966-10-04 | Burroughs Corp | Telephone adapter |
KR900003620B1 (en) * | 1984-07-24 | 1990-05-26 | 후지쓰가부시끼가이샤 | Lock-releasing mechanism for telephone set with muting function |
WO2005081501A1 (en) * | 2004-02-20 | 2005-09-01 | Temco Japan Co., Ltd. | Bone-conduction handset |
-
0
- BE BE434077D patent/BE434077A/xx unknown
-
1938
- 1938-05-18 GB GB14835/38A patent/GB514905A/en not_active Expired
-
1939
- 1939-05-03 CH CH219316D patent/CH219316A/en unknown
- 1939-05-04 FR FR854285D patent/FR854285A/en not_active Expired
- 1939-05-11 US US272951A patent/US2245835A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CH219316A (en) | 1942-01-31 |
US2245835A (en) | 1941-06-17 |
FR854285A (en) | 1940-04-09 |
BE434077A (en) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB744358A (en) | Improvements in or relating to telephone subscriber's metering equipment | |
GB550244A (en) | Improvements in telephone systems | |
GB514905A (en) | Improvements in or relating to telephone instruments | |
GB567600A (en) | Improvements in telephone instruments | |
GB544364A (en) | Telephone circuits | |
GB459024A (en) | Improvements in elastic sanitary telephone protectors | |
GB513409A (en) | Improvements in or relating to electrical signalling systems | |
GB788594A (en) | Improvements in or relating to automatic telecommunication exchange systems | |
GB509664A (en) | Improvements in or relating to pencils | |
GB516991A (en) | Improvements in or relating to telephone subset equipment | |
GB396165A (en) | Improvements in or relating to loud speakers | |
USD152278S (en) | Combined telephone desk stand and handset | |
GB527026A (en) | Improvements in or relating to loud-speakers | |
GB555523A (en) | Bridge-stabilised oscillators for voice frequency circuits | |
AU106581B2 (en) | Improvements in or relating to telephone handsets | |
GB491010A (en) | Improvements in apparatus making possible the permanent recording, automatically, of oral telephone conversations | |
GB535787A (en) | Improvements in or relating to telephone subsets | |
AU107855B2 (en) | Improvements in. or relating to amplifiers and repeaters employing negative back coupling | |
CA364683A (en) | Telephone stand, secretary and bookrack | |
AU109724B2 (en) | Improvements in telephone instruments | |
AU271738A (en) | Improvements in. or relating to amplifiers and repeaters employing negative back coupling | |
GB443024A (en) | Improvements relating to combination cabinet and like furniture | |
GB564502A (en) | Writing pad equipment | |
AU108297B2 (en) | Improvements in, or relating to, electrical socket couplings switch-sockets and similar electrical accessories | |
GB556928A (en) | Improvements in or relating to automatic or semi-automatic telephone systems |