CH247563A - Loudspeaker telephone system. - Google Patents

Loudspeaker telephone system.

Info

Publication number: CH247563A
Authority: CH; Switzerland
Prior art keywords: telephone system; loudspeaker telephone; loudspeaker; telephone
Prior art date: 1943-02-18

Application number

Other languages

German (de)

Inventor

Ag Standard Telephon Und Radio

Original Assignee

Standard Telephon & Radio Ag

Priority date (The priority date 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 date listed.)

1943-02-18

Filing date

1944-02-18

Publication date

1947-03-15

1944-02-18 Application filed by Standard Telephon & Radio Ag filed Critical Standard Telephon & Radio Ag

1947-03-15 Publication of CH247563A publication Critical patent/CH247563A/en

Classifications

- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/02—Manually-operated control
- H03G5/04—Manually-operated control in untuned amplifiers
- H03G5/06—Manually-operated control in untuned amplifiers having discharge tubes
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)

CH247563D 1943-02-18 1944-02-18 Loudspeaker telephone system. CH247563A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
NL247563X		1943-02-18

Publications (1)

Publication Number	Publication Date
CH247563A true CH247563A (en)	1947-03-15

Family

ID=19780914

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CH247563D CH247563A (en)	1943-02-18	1944-02-18	Loudspeaker telephone system.

Country Status (4)

Country	Link
BE (1)	BE454425A (en)
CH (1)	CH247563A (en)
FR (1)	FR904080A (en)
NL (1)	NL58180C (en)

0
- NL NL58180D patent/NL58180C/xx active
- BE BE454425D patent/BE454425A/xx unknown
1944
- 1944-02-17 FR FR904080D patent/FR904080A/en not_active Expired
- 1944-02-18 CH CH247563D patent/CH247563A/en unknown

Also Published As

Publication number	Publication date
FR904080A (en)	1945-10-25
NL58180C (en)
BE454425A (en)

Similar Documents

Publication	Publication Date	Title
CH261511A (en)	1949-05-15	Telecommunications office installation.
CH256408A (en)	1948-08-31	Motocultor.
CH261402A (en)	1949-05-15	Stylograph.
CH247010A (en)	1947-02-15	Stylograph.
CH245420A (en)	1946-11-15	Electrodynamic speaker.
CH258727A (en)	1948-12-15	Telecommunication system.
CH276282A (en)	1951-06-30	Telecommunications exchange system.
CH241312A (en)	1946-02-28	Telephone set.
CH247563A (en)	1947-03-15	Loudspeaker telephone system.
CH257773A (en)	1948-10-31	Electroacoustic converter.
CH250533A (en)	1947-08-31	Grain microphone.
FR942753A (en)	1949-02-17	Telephone system
CH261676A (en)	1949-05-31	Montre-réveil.
CH249974A (en)	1947-07-31	Character dialer.
AT167786B (en)	1951-02-26	Telecommunication system
CH246848A (en)	1947-01-31	Telecommunication system.
CH245733A (en)	1946-11-30	Electrodynamic phonogram scanner.
CH237706A (en)	1945-05-15	Telephone station.
DK66117C (en)	1947-12-29	Microphone.
DK70901C (en)	1950-04-17	Electric call system.
DK66847C (en)	1948-05-24	Telephone board.
DK73011C (en)	1951-09-03	Telephone system.
CH252031A (en)	1947-11-30	Intercom.
DK79923C (en)	1955-10-03	Automatic telephone exchange system.
DK71785C (en)	1950-12-04	Local telephone system.