NL68231C - - Google Patents

Info

Publication number: NL68231C
Authority: NL; Netherlands

Application number

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.)

1944-03-25

Publication of NL68231C publication Critical patent/NL68231C/xx

Classifications

- 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)
Interconnected Communication Systems, Intercoms, And Interphones (AREA)

NL68231D 1944-03-25 NL68231C (enrdf_load_html_response)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US528030A US2385515A (en)	1944-03-25	1944-03-25	Intercommunication system

Publications (1)

Publication Number	Publication Date
NL68231C true NL68231C (enrdf_load_html_response)

Family

ID=24103974

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
NL68231D NL68231C (enrdf_load_html_response)	1944-03-25

Country Status (3)

Country	Link
US (1)	US2385515A (enrdf_load_html_response)
FR (1)	FR938541A (enrdf_load_html_response)
NL (1)	NL68231C (enrdf_load_html_response)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2632056A (en) *	1947-12-30	1953-03-17	Rauland Corp	Busy signal for intercommunicating telephone systems
US2547854A (en) *	1948-02-06	1951-04-03	Webster Electric Co Inc	Intercommunication apparatus
US2744966A (en) *	1950-10-05	1956-05-08	Executone Inf Sys Inc	Intercommunication system
US2802055A (en) *	1952-08-29	1957-08-06	Siemens Ag	Two-way loudspeaker intercommunication system
US2741667A (en) *	1953-02-11	1956-04-10	Commercial Radio Sound Corp	Privacy guarded telephone intercommunicating system
BE539028A (enrdf_load_html_response) *	1954-08-23

0
- NL NL68231D patent/NL68231C/xx active
1944
- 1944-03-25 US US528030A patent/US2385515A/en not_active Expired - Lifetime
1946
- 1946-12-20 FR FR938541D patent/FR938541A/fr not_active Expired

Also Published As

Publication number	Publication date
US2385515A (en)	1945-09-25
FR938541A (fr)	1948-10-18

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