GB417915A - Telephone device and other signalling arrangement to be operated with or without amplifier - Google Patents
Telephone device and other signalling arrangement to be operated with or without amplifierInfo
- Publication number
- GB417915A GB417915A GB67933A GB67933A GB417915A GB 417915 A GB417915 A GB 417915A GB 67933 A GB67933 A GB 67933A GB 67933 A GB67933 A GB 67933A GB 417915 A GB417915 A GB 417915A
- Authority
- GB
- United Kingdom
- Prior art keywords
- socket
- plug
- amplifier
- operated
- keeper
- 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
- H04M1/60—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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
417,915. Electric signalling systems. BENAUDI-TELEPHON GES., 11, Spessartstrasse, Wilmersdorf, Berlin. Jan. 9, 1933, No. 679. Void [Abridged as open to inspection under Sect. 91 of the Acts, July 10, 1933]. [Class 40 (i).] The usual door-keeper's bell-circuit comprising push-button D and bell K is split into two parts B1, B2 normally connected by a plug and socket B3, B4, Fig. 3a. When it is desired to actuate alarms at places distant from the door-keeper's box, e.g. in his absence, the plug and socket are disconnected, and engaged with a socket and plug leading to an amplifier Z, Fig. 3b, which supplies one or more loud-speakers L and reinforces the current in the normal bellcircuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB67933A GB417915A (en) | 1933-01-09 | 1933-01-09 | Telephone device and other signalling arrangement to be operated with or without amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB67933A GB417915A (en) | 1933-01-09 | 1933-01-09 | Telephone device and other signalling arrangement to be operated with or without amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB417915A true GB417915A (en) | 1934-10-15 |
Family
ID=9708627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB67933A Expired GB417915A (en) | 1933-01-09 | 1933-01-09 | Telephone device and other signalling arrangement to be operated with or without amplifier |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB417915A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4446335A (en) * | 1982-01-25 | 1984-05-01 | Dynametric, Inc. | Telephone signal recording methods and apparatus |
| GB2242099A (en) * | 1990-03-14 | 1991-09-18 | Hosiden Besson Ltd | Auxiliary telephone receiver unit |
-
1933
- 1933-01-09 GB GB67933A patent/GB417915A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4446335A (en) * | 1982-01-25 | 1984-05-01 | Dynametric, Inc. | Telephone signal recording methods and apparatus |
| GB2242099A (en) * | 1990-03-14 | 1991-09-18 | Hosiden Besson Ltd | Auxiliary telephone receiver unit |
| GB2242099B (en) * | 1990-03-14 | 1994-06-08 | Hosiden Besson Ltd | Auxiliary telephone receiver unit |
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