NL22541C - - Google Patents
Info
- Publication number
- NL22541C NL22541C NL22541DA NL22541C NL 22541 C NL22541 C NL 22541C NL 22541D A NL22541D A NL 22541DA NL 22541 C NL22541 C NL 22541C
- Authority
- NL
- Netherlands
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
- H04R19/00—Electrostatic transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US142790A US1722347A (en) | 1926-10-20 | 1926-10-20 | Acoustic apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL22541C true NL22541C (en) |
Family
ID=22501288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL22541D NL22541C (en) | 1926-10-20 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US1722347A (en) |
| BE (1) | BE345155A (en) |
| DE (1) | DE519901C (en) |
| FR (1) | FR639320A (en) |
| GB (1) | GB279390A (en) |
| NL (1) | NL22541C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2500643A (en) * | 1946-12-07 | 1950-03-14 | Bell Telephone Labor Inc | Condenser transducer independent of ambient atmospheric conditions |
| JPS5121791B2 (en) * | 1972-08-04 | 1976-07-05 |
-
0
- NL NL22541D patent/NL22541C/xx active
- BE BE345155D patent/BE345155A/xx unknown
-
1926
- 1926-10-20 US US142790A patent/US1722347A/en not_active Expired - Lifetime
-
1927
- 1927-07-21 GB GB19382/27A patent/GB279390A/en not_active Expired
- 1927-07-30 DE DEE36023D patent/DE519901C/en not_active Expired
- 1927-08-11 FR FR639320D patent/FR639320A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR639320A (en) | 1928-06-19 |
| DE519901C (en) | 1931-03-06 |
| BE345155A (en) | |
| US1722347A (en) | 1929-07-30 |
| GB279390A (en) | 1928-10-22 |