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GB478229A - Improvements in or relating to dial switches, more particularly for telephone systems - Google Patents

Improvements in or relating to dial switches, more particularly for telephone systems

Info

Publication number
GB478229A
GB478229A GB10956/37A GB1095637A GB478229A GB 478229 A GB478229 A GB 478229A GB 10956/37 A GB10956/37 A GB 10956/37A GB 1095637 A GB1095637 A GB 1095637A GB 478229 A GB478229 A GB 478229A
Authority
GB
United Kingdom
Prior art keywords
relating
dial
telephone systems
dial switches
digit
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
GB10956/37A
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.)
Telephon Apparat Fabrik E Zwietusch and Co
Original Assignee
Telephon Apparat Fabrik E Zwietusch and Co
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 Telephon Apparat Fabrik E Zwietusch and Co filed Critical Telephon Apparat Fabrik E Zwietusch and Co
Publication of GB478229A publication Critical patent/GB478229A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
    • H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
    • H04M17/026—Constructional features

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

478,229. Impulse transmitters. TELEPHON APPARAT FABRIK E. ZWIETUSH & CO., GES. April 16, 1937, No. 10956. Convention date, Nov. 23, 1936. Drawings to Specification. [Class 40 (iv)] In a dial adapted to prevent the transmission of certain multi-digit numbers, the blocking device including the means for restoring it when the receiver is replaced, is constructed as a unit assembly adapted to be mounted on and within the area of the base plate of a normal dial. The device described is an adaptation for four digit discrimination of the arrangement described in. Specification 466,338.
GB10956/37A 1936-11-23 1937-04-16 Improvements in or relating to dial switches, more particularly for telephone systems Expired GB478229A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE478229X 1936-11-23

Publications (1)

Publication Number Publication Date
GB478229A true GB478229A (en) 1938-01-14

Family

ID=6542224

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10956/37A Expired GB478229A (en) 1936-11-23 1937-04-16 Improvements in or relating to dial switches, more particularly for telephone systems

Country Status (1)

Country Link
GB (1) GB478229A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3681532A (en) * 1969-01-15 1972-08-01 Int Standard Electric Corp Restricted dial telephone station

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3681532A (en) * 1969-01-15 1972-08-01 Int Standard Electric Corp Restricted dial telephone station

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