GB509827A - Improvements in or relating to spring-driven impulse dials of the type used in telephone systems - Google Patents

Improvements in or relating to spring-driven impulse dials of the type used in telephone systems

Info

Publication number
GB509827A
GB509827A GB167238A GB167238A GB509827A GB 509827 A GB509827 A GB 509827A GB 167238 A GB167238 A GB 167238A GB 167238 A GB167238 A GB 167238A GB 509827 A GB509827 A GB 509827A
Authority
GB
United Kingdom
Prior art keywords
spring
magnet
plate
disc
soft iron
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
GB167238A
Other languages
English (en)
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.)
HAROLD HERBERT JAMES SPARKES
STC PLC
Original Assignee
HAROLD HERBERT JAMES SPARKES
Standard Telephone and Cables PLC
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
Priority to BE432170D priority Critical patent/BE432170A/xx
Application filed by HAROLD HERBERT JAMES SPARKES, Standard Telephone and Cables PLC filed Critical HAROLD HERBERT JAMES SPARKES
Priority to GB167238A priority patent/GB509827A/en
Publication of GB509827A publication Critical patent/GB509827A/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
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
GB167238A 1938-01-18 1938-01-18 Improvements in or relating to spring-driven impulse dials of the type used in telephone systems Expired GB509827A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE432170D BE432170A (enrdf_load_stackoverflow) 1938-01-18
GB167238A GB509827A (en) 1938-01-18 1938-01-18 Improvements in or relating to spring-driven impulse dials of the type used in telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB167238A GB509827A (en) 1938-01-18 1938-01-18 Improvements in or relating to spring-driven impulse dials of the type used in telephone systems

Publications (1)

Publication Number Publication Date
GB509827A true GB509827A (en) 1939-07-18

Family

ID=9726029

Family Applications (1)

Application Number Title Priority Date Filing Date
GB167238A Expired GB509827A (en) 1938-01-18 1938-01-18 Improvements in or relating to spring-driven impulse dials of the type used in telephone systems

Country Status (2)

Country Link
BE (1) BE432170A (enrdf_load_stackoverflow)
GB (1) GB509827A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
BE432170A (enrdf_load_stackoverflow)

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