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FR701659A - if for automatic switching on, by a telephone, lighting device or any light signal - Google Patents

if for automatic switching on, by a telephone, lighting device or any light signal

Info

Publication number
FR701659A
FR701659A FR701659DA FR701659A FR 701659 A FR701659 A FR 701659A FR 701659D A FR701659D A FR 701659DA FR 701659 A FR701659 A FR 701659A
Authority
FR
France
Prior art keywords
telephone
lighting device
light signal
automatic switching
switching
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR701659A publication Critical patent/FR701659A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR701659D 1930-09-04 1930-09-04 if for automatic switching on, by a telephone, lighting device or any light signal Expired FR701659A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR701659T 1930-09-04

Publications (1)

Publication Number Publication Date
FR701659A true FR701659A (en) 1931-03-20

Family

ID=9055181

Family Applications (1)

Application Number Title Priority Date Filing Date
FR701659D Expired FR701659A (en) 1930-09-04 1930-09-04 if for automatic switching on, by a telephone, lighting device or any light signal

Country Status (1)

Country Link
FR (1) FR701659A (en)

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