FR64910E - Improvements to doubling signaling devices - Google Patents
Improvements to doubling signaling devicesInfo
- Publication number
- FR64910E FR64910E FR64910DA FR64910E FR 64910 E FR64910 E FR 64910E FR 64910D A FR64910D A FR 64910DA FR 64910 E FR64910 E FR 64910E
- Authority
- FR
- France
- Prior art keywords
- doubling
- signaling devices
- signaling
- devices
- doubling signaling
- 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
Links
- 230000011664 signaling Effects 0.000 title 1
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)
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)
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 |
---|---|
GB705450A (en) | 1954-03-10 |
FR1047370A (en) | 1953-12-14 |
GB717090A (en) | 1954-10-20 |
IT500018A (en) | |
DE923354C (en) | 1955-02-10 |
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