BE427523A - - Google Patents

Info

Publication number: BE427523A
Authority: BE; Belgium

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.)

1938-04-07

Publication of BE427523A publication Critical patent/BE427523A/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)
Emergency Alarm Devices (AREA)

BE427523D 1938-04-07 BE427523A (US06265458-20010724-C00033.png)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR49397T		1938-04-07

Publications (1)

Publication Number	Publication Date
BE427523A true BE427523A (US06265458-20010724-C00033.png)

Family

ID=8684581

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BE427523D BE427523A (US06265458-20010724-C00033.png)	1938-04-07

Country Status (3)

Country	Link
BE (1)	BE427523A (US06265458-20010724-C00033.png)
FR (2)	FR831632A (US06265458-20010724-C00033.png)
GB (1)	GB507697A (US06265458-20010724-C00033.png)

0
- BE BE427523D patent/BE427523A/xx unknown
1937
- 1937-04-13 FR FR831632D patent/FR831632A/fr not_active Expired
1938
- 1938-04-07 FR FR49397D patent/FR49397E/fr not_active Expired
- 1938-04-13 GB GB11413/38A patent/GB507697A/en not_active Expired

Also Published As

Publication number	Publication date
FR49397E (fr)	1939-03-24
FR831632A (fr)	1938-09-09
GB507697A (en)	1939-06-20

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