NL7208873A - - Google Patents

Info

Publication number
NL7208873A
NL7208873A NL7208873A NL7208873A NL7208873A NL 7208873 A NL7208873 A NL 7208873A NL 7208873 A NL7208873 A NL 7208873A NL 7208873 A NL7208873 A NL 7208873A NL 7208873 A NL7208873 A NL 7208873A
Authority
NL
Netherlands
Application number
NL7208873A
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 filed Critical
Priority to NL7208873A priority Critical patent/NL7208873A/xx
Priority to DE19732329593 priority patent/DE2329593A1/en
Priority to IT6889273A priority patent/IT986585B/en
Priority to JP48070903A priority patent/JPS4986036A/ja
Priority to FR7323346A priority patent/FR2191180B1/fr
Publication of NL7208873A publication Critical patent/NL7208873A/xx

Links

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/16Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1681Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
NL7208873A 1972-06-28 1972-06-28 NL7208873A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL7208873A NL7208873A (en) 1972-06-28 1972-06-28
DE19732329593 DE2329593A1 (en) 1972-06-28 1973-06-09 AREA SURVEILLANCE SYSTEM WITH AT LEAST ONE MICROPHONE THAT IS ACOUSTICALLY CONNECTED TO AT LEAST ONE PIPE
IT6889273A IT986585B (en) 1972-06-28 1973-06-25 COM AREA SECURITY SYSTEM TAKING AT LEAST ONE AC MICROPHONE PAIRED ACOUSTICALLY WITH AN UNDERGROUND TU BO
JP48070903A JPS4986036A (en) 1972-06-28 1973-06-25
FR7323346A FR2191180B1 (en) 1972-06-28 1973-06-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7208873A NL7208873A (en) 1972-06-28 1972-06-28

Publications (1)

Publication Number Publication Date
NL7208873A true NL7208873A (en) 1974-01-02

Family

ID=19816393

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7208873A NL7208873A (en) 1972-06-28 1972-06-28

Country Status (5)

Country Link
JP (1) JPS4986036A (en)
DE (1) DE2329593A1 (en)
FR (1) FR2191180B1 (en)
IT (1) IT986585B (en)
NL (1) NL7208873A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560701B1 (en) * 1984-03-05 1987-04-17 Sogesec Sarl DIFFERENTIAL PRESSURE ACCESS DETECTOR

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1267874A (en) * 1960-06-14 1961-07-28 Wattson Sa Method and device for detecting crossing locating
IL29843A (en) * 1967-08-24 1971-07-28 Westinghouse Electric Corp Intruder detecting apparatus

Also Published As

Publication number Publication date
JPS4986036A (en) 1974-08-17
FR2191180B1 (en) 1976-09-17
IT986585B (en) 1975-01-30
DE2329593A1 (en) 1974-01-10
FR2191180A1 (en) 1974-02-01

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