FR64910E - Improvements to doubling signaling devices - Google Patents

Improvements to doubling signaling devices

Info

Publication number: FR64910E
Authority: FR; France
Prior art keywords: doubling; signaling devices; signaling; devices; doubling signaling
Prior art date: 1951-07-24
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

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.)

PHYSIKALISCH TECH WERKSTATTEN

Original Assignee

PHYSIKALISCH TECH WERKSTATTEN

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.)

1951-07-24

Filing date

1952-07-08

Publication date

1955-12-14

1952-07-08 Application filed by PHYSIKALISCH TECH WERKSTATTEN filed Critical PHYSIKALISCH TECH WERKSTATTEN

1955-12-14 Application granted granted Critical

1955-12-14 Publication of FR64910E publication Critical patent/FR64910E/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
- H04R1/086—Protective screens, e.g. all weather or wind screens

Landscapes

Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
General Physics & Mathematics (AREA)
Electromagnetism (AREA)
Piezo-Electric Transducers For Audible Bands (AREA)
Exhaust Silencers (AREA)

FR64910D 1951-07-24 1952-07-08 Improvements to doubling signaling devices Expired FR64910E (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DEP5919A DE923354C (en)	1951-07-24	1951-07-24	Overtaking signal system

Publications (1)

Publication Number	Publication Date
FR64910E true FR64910E (en)	1955-12-14

Family

ID=6626604

Family Applications (2)

Application Number	Title	Priority Date	Filing Date
FR1047370D Expired FR1047370A (en)	1951-07-24	1951-12-28	Improvements to doubling signaling devices
FR64910D Expired FR64910E (en)	1951-07-24	1952-07-08	Improvements to doubling signaling devices

Family Applications Before (1)

Application Number	Title	Priority Date	Filing Date
FR1047370D Expired FR1047370A (en)	1951-07-24	1951-12-28	Improvements to doubling signaling devices

Country Status (4)

Country	Link
DE (1)	DE923354C (en)
FR (2)	FR1047370A (en)
GB (2)	GB705450A (en)
IT (1)	IT500018A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2931020A (en) *	1955-07-11	1960-03-29	Thomas J Bender	Secondary alarm system
DE1112927B (en) *	1956-05-08	1961-08-17	Tele F Lux Soc A R L	Method for the electrical transmission of acoustic overtaking signals from vehicles
US3670689A (en) *	1970-03-20	1972-06-20	Falcon Safety Prod	Tilt-operated hand held gas powered acoustic device
DE10003689C1 (en) *	2000-01-28	2001-05-23	Hella Kg Hueck & Co	Power matching circuit for loudspeaker amplifier for automobile warning siren, has switching device connecting loudspeaker to different transformer windings or tap-off connections dependent on supply voltage
DE102017220474A1 (en) *	2017-11-16	2019-05-16	Robert Bosch Gmbh	Device for airborne acoustic sensing of the surroundings of a vehicle, vehicle
EP3907502A1 (en) *	2020-05-08	2021-11-10	ABB Schweiz AG	Sensing arrangement

0
- IT IT500018D patent/IT500018A/it unknown
1951
- 1951-07-24 DE DEP5919A patent/DE923354C/en not_active Expired
- 1951-12-28 FR FR1047370D patent/FR1047370A/en not_active Expired
1952
- 1952-01-08 GB GB622/52A patent/GB705450A/en not_active Expired
- 1952-07-08 FR FR64910D patent/FR64910E/en not_active Expired
- 1952-07-23 GB GB18697/52A patent/GB717090A/en not_active Expired

Also Published As

Publication number	Publication date
DE923354C (en)	1955-02-10
GB705450A (en)	1954-03-10
IT500018A (en)
FR1047370A (en)	1953-12-14
GB717090A (en)	1954-10-20

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