FR954725A - - Google Patents
Info
- Publication number
- FR954725A FR954725A FR954725DA FR954725A FR 954725 A FR954725 A FR 954725A FR 954725D A FR954725D A FR 954725DA FR 954725 A FR954725 A FR 954725A
- Authority
- FR
- France
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J21/00—Vacuum tubes
- H01J21/02—Tubes with a single discharge path
- H01J21/06—Tubes with a single discharge path having electrostatic control means only
- H01J21/08—Tubes with a single discharge path having electrostatic control means only with movable electrode or electrodes
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US706967A US2491390A (en) | 1946-10-31 | 1946-10-31 | Electronic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR954725A true FR954725A (fi) | 1950-01-05 |
Family
ID=24839823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR954725D Expired FR954725A (fi) | 1946-10-31 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2491390A (fi) |
| FR (1) | FR954725A (fi) |
| GB (1) | GB647152A (fi) |
| NL (1) | NL71653C (fi) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2680779A (en) * | 1949-05-06 | 1954-06-08 | Rca Corp | Communication compensation system for atmospheric pressure variation |
| US2666200A (en) * | 1950-11-30 | 1954-01-12 | Rca Corp | Electronic transducer tube |
| US2983790A (en) * | 1953-04-30 | 1961-05-09 | Rca Corp | Electronic sound absorber |
| US2809520A (en) * | 1954-03-01 | 1957-10-15 | Jr Joseph D Richard | Fluid velocity measuring apparatus |
| US2974274A (en) * | 1955-12-13 | 1961-03-07 | Lindberg | Secondary-emission cathode-ray tube and engine analyzer employing the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2142857A (en) * | 1935-05-24 | 1939-01-03 | Gen Electric | Vacuum tube |
| US2165981A (en) * | 1936-08-27 | 1939-07-11 | Julian E Sampson | Electronic phonograph pick-up |
-
0
- FR FR954725D patent/FR954725A/fr not_active Expired
- NL NL71653D patent/NL71653C/xx active
-
1946
- 1946-10-31 US US706967A patent/US2491390A/en not_active Expired - Lifetime
-
1947
- 1947-10-24 GB GB28496/47A patent/GB647152A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB647152A (en) | 1950-12-06 |
| US2491390A (en) | 1949-12-13 |
| NL71653C (fi) |