GB191122238A - Improvements in Electric Signalling Apparatus for Telephones and the like. - Google Patents

Improvements in Electric Signalling Apparatus for Telephones and the like.

Info

Publication number
GB191122238A
GB191122238A GB191122238DA GB191122238A GB 191122238 A GB191122238 A GB 191122238A GB 191122238D A GB191122238D A GB 191122238DA GB 191122238 A GB191122238 A GB 191122238A
Authority
GB
United Kingdom
Prior art keywords
telephones
signalling apparatus
electric signalling
electric
signalling
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
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.)
WESTERN ELECTRIC CO Ltd
Original Assignee
WESTERN ELECTRIC CO 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 WESTERN ELECTRIC CO Ltd filed Critical WESTERN ELECTRIC CO Ltd
Application granted granted Critical
Publication of GB191122238A publication Critical patent/GB191122238A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
GB191122238D 1911-10-09 1911-10-09 Improvements in Electric Signalling Apparatus for Telephones and the like. Expired GB191122238A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191122238T 1911-10-09

Publications (1)

Publication Number Publication Date
GB191122238A true GB191122238A (en) 1912-10-09

Family

ID=33446200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191122238D Expired GB191122238A (en) 1911-10-09 1911-10-09 Improvements in Electric Signalling Apparatus for Telephones and the like.

Country Status (1)

Country Link
GB (1) GB191122238A (en)

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