BE410671A - - Google Patents
Info
- Publication number
- BE410671A BE410671A BE410671DA BE410671A BE 410671 A BE410671 A BE 410671A BE 410671D A BE410671D A BE 410671DA BE 410671 A BE410671 A BE 410671A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1008—Earpieces of the supra-aural or circum-aural type
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2134084X | 1935-04-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE410671A true BE410671A (https=) |
Family
ID=7986540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE410671D BE410671A (https=) | 1935-04-09 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2134084A (https=) |
| BE (1) | BE410671A (https=) |
| CH (1) | CH190273A (https=) |
| FR (1) | FR793231A (https=) |
-
0
- BE BE410671D patent/BE410671A/xx unknown
-
1935
- 1935-07-29 CH CH190273D patent/CH190273A/de unknown
- 1935-08-01 FR FR793231D patent/FR793231A/fr not_active Expired
- 1935-08-19 US US36915A patent/US2134084A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR793231A (fr) | 1936-01-20 |
| US2134084A (en) | 1938-10-25 |
| CH190273A (de) | 1937-04-15 |