NL275488A - - Google Patents
Info
- Publication number
- NL275488A NL275488A NL275488DA NL275488A NL 275488 A NL275488 A NL 275488A NL 275488D A NL275488D A NL 275488DA NL 275488 A NL275488 A NL 275488A
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Telephone Set Structure (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Measuring Fluid Pressure (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES72788A DE1161314B (de) | 1961-03-02 | 1961-03-02 | Kohlemikrofonkapsel mit feuchtigkeitsgeschuetzter Kohlekammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL275488A true NL275488A (da) |
Family
ID=7503475
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL275488D NL275488A (da) | 1961-03-02 | ||
| NL62275488A NL142046B (nl) | 1961-03-02 | 1962-03-02 | Koolmicrofoon. |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL62275488A NL142046B (nl) | 1961-03-02 | 1962-03-02 | Koolmicrofoon. |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3277247A (da) |
| BE (1) | BE614554A (da) |
| CH (1) | CH402950A (da) |
| DE (1) | DE1161314B (da) |
| GB (1) | GB957384A (da) |
| NL (2) | NL142046B (da) |
| SE (1) | SE325613B (da) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE898763C (de) * | 1937-04-19 | 1953-12-03 | Int Standard Electric Corp | Kohlekoernermikrofon |
| CH220358A (de) * | 1940-10-26 | 1942-03-31 | Fides Gmbh | Kapselmikrofon. |
| NL70196C (da) * | 1947-10-31 | |||
| DE1000049B (de) * | 1954-12-23 | 1957-01-03 | Merk Ag Telefonbau Friedrich | Widerstandsmikrophon, insbesondere Kohlemikrophon |
-
0
- NL NL275488D patent/NL275488A/xx unknown
-
1961
- 1961-03-02 DE DES72788A patent/DE1161314B/de active Pending
- 1961-12-07 CH CH1428661A patent/CH402950A/de unknown
-
1962
- 1962-02-27 US US175960A patent/US3277247A/en not_active Expired - Lifetime
- 1962-02-28 SE SE02254/62A patent/SE325613B/xx unknown
- 1962-03-01 BE BE614554A patent/BE614554A/fr unknown
- 1962-03-02 NL NL62275488A patent/NL142046B/xx unknown
- 1962-03-02 GB GB8126/62A patent/GB957384A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1161314B (de) | 1964-01-16 |
| CH402950A (de) | 1965-11-30 |
| US3277247A (en) | 1966-10-04 |
| GB957384A (en) | 1964-05-06 |
| SE325613B (da) | 1970-07-06 |
| NL142046B (nl) | 1974-04-16 |
| BE614554A (fr) | 1962-07-02 |