FR684375A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR684375A
FR684375A FR684375DA FR684375A FR 684375 A FR684375 A FR 684375A FR 684375D A FR684375D A FR 684375DA FR 684375 A FR684375 A FR 684375A
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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
Application number
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BUROVOX Ltd
Original Assignee
BUROVOX Ltd
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.)
Filing date
Publication date
Application filed by BUROVOX Ltd filed Critical BUROVOX Ltd
Application granted granted Critical
Publication of FR684375A publication Critical patent/FR684375A/en
Expired legal-status Critical Current

Links

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
FR684375D 1928-11-15 1929-11-05 Improvements to telephone systems Expired FR684375A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB33512/28A GB325274A (en) 1928-11-15 1928-11-15 Improvements in and relating to telephone systems

Publications (1)

Publication Number Publication Date
FR684375A true FR684375A (en) 1930-06-25

Family

ID=10353936

Family Applications (1)

Application Number Title Priority Date Filing Date
FR684375D Expired FR684375A (en) 1928-11-15 1929-11-05 Improvements to telephone systems

Country Status (3)

Country Link
US (1) US1838586A (en)
FR (1) FR684375A (en)
GB (1) GB325274A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5386463A (en) * 1992-11-17 1995-01-31 Kings Iii Of America, Inc., North America Low noise multi-elevator communication system and method

Also Published As

Publication number Publication date
GB325274A (en) 1930-02-17
US1838586A (en) 1931-12-29

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