BE521894A - - Google Patents

Info

Publication number
BE521894A
BE521894A BE521894DA BE521894A BE 521894 A BE521894 A BE 521894A BE 521894D A BE521894D A BE 521894DA BE 521894 A BE521894 A BE 521894A
Authority
BE
Belgium
Prior art keywords
signal
circuit
station
signals
telephone
Prior art date
Application number
Other languages
English (en)
French (fr)
Publication of BE521894A publication Critical patent/BE521894A/fr

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
    • G07C1/20—Checking timed patrols, e.g. of watchman

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Selective Calling Equipment (AREA)
BE521894D BE521894A (enrdf_load_stackoverflow)

Publications (1)

Publication Number Publication Date
BE521894A true BE521894A (enrdf_load_stackoverflow)

Family

ID=157334

Family Applications (1)

Application Number Title Priority Date Filing Date
BE521894D BE521894A (enrdf_load_stackoverflow)

Country Status (1)

Country Link
BE (1) BE521894A (enrdf_load_stackoverflow)

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