FR644354A - Protection device by frequency variation of an oscillating circuit - Google Patents

Protection device by frequency variation of an oscillating circuit

Info

Publication number
FR644354A
FR644354A FR644354DA FR644354A FR 644354 A FR644354 A FR 644354A FR 644354D A FR644354D A FR 644354DA FR 644354 A FR644354 A FR 644354A
Authority
FR
France
Prior art keywords
protection device
oscillating circuit
frequency variation
variation
frequency
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)
Inventor
Louis-Auguste-Marie Laboureur
Pierre-Jules Briot
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
Application granted granted Critical
Publication of FR644354A publication Critical patent/FR644354A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR644354D 1926-11-30 1927-11-22 Protection device by frequency variation of an oscillating circuit Expired FR644354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT644354X 1926-11-30

Publications (1)

Publication Number Publication Date
FR644354A true FR644354A (en) 1928-10-06

Family

ID=11296820

Family Applications (1)

Application Number Title Priority Date Filing Date
FR644354D Expired FR644354A (en) 1926-11-30 1927-11-22 Protection device by frequency variation of an oscillating circuit

Country Status (1)

Country Link
FR (1) FR644354A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2969736A (en) * 1941-11-07 1961-01-31 Westinghouse Electric Corp Means for exploding bombs
US3199096A (en) * 1960-09-14 1965-08-03 Specialties Dev Corp Capacity alarm system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2969736A (en) * 1941-11-07 1961-01-31 Westinghouse Electric Corp Means for exploding bombs
US3199096A (en) * 1960-09-14 1965-08-03 Specialties Dev Corp Capacity alarm system

Similar Documents

Publication Publication Date Title
FR634695A (en) Electrostatic vibratory device
FR644354A (en) Protection device by frequency variation of an oscillating circuit
FR634311A (en) Slaving device of any mechanism
FR628263A (en) Device for adjusting the natural frequency of an oscillating electric circuit
FR637815A (en) Radio-electric tuning device
FR545911A (en) Snap-in device
FR560283A (en) Sound-producing device
FR593227A (en) Frequency multiplier device
FR597414A (en) Frequency multiplier device
FR591694A (en) Frequency changer device
FR564745A (en) High frequency signaling device
FR636142A (en) High frequency electric shock amplifier device
FR622274A (en) Crankshaft device
FR32402E (en) Device for stroboscopic adjustment of counters
FR625270A (en) Device for stroboscopic adjustment of counters
FR619437A (en) Fully removable etripene device
FR602047A (en) Device for radiotelegraphic setting of clocks
FR546664A (en) Entertainment device
FR563937A (en) Cascade transformer device
FR639624A (en) Ignition device
FR591058A (en) High frequency current modulation device
FR589821A (en) High frequency alternator mounting device
FR616064A (en) Trigger device for alarm clocks
FR555261A (en) Turbine device
FR624463A (en) Luxmeter device