BR7308746D0 - Microfone de carvao - Google Patents
Microfone de carvaoInfo
- Publication number
- BR7308746D0 BR7308746D0 BR8746/73A BR874673A BR7308746D0 BR 7308746 D0 BR7308746 D0 BR 7308746D0 BR 8746/73 A BR8746/73 A BR 8746/73A BR 874673 A BR874673 A BR 874673A BR 7308746 D0 BR7308746 D0 BR 7308746D0
- Authority
- BR
- Brazil
- Prior art keywords
- coal
- microphone
- coal microphone
- Prior art date
Links
- 239000003245 coal Substances 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
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Lubricants (AREA)
- Carbon And Carbon Compounds (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Telephone Set Structure (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5431472A GB1360559A (en) | 1972-11-24 | 1972-11-24 | Carbon microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BR7308746D0 true BR7308746D0 (pt) | 1974-08-22 |
Family
ID=10470609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR8746/73A BR7308746D0 (pt) | 1972-11-24 | 1973-11-08 | Microfone de carvao |
Country Status (15)
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5541570A (en) * | 1994-12-09 | 1996-07-30 | Force Imaging Technologies, Inc. | Force sensing ink, method of making same and improved force sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US486244A (en) * | 1892-11-15 | Charles clamond | ||
| US919908A (en) * | 1908-07-13 | 1909-04-27 | Harold Sheen Martin | Electrical-resistance device. |
| US1086726A (en) * | 1909-03-11 | 1914-02-10 | Johan Burchardt Opsahl | Resistance unit. |
-
1972
- 1972-11-24 GB GB5431472A patent/GB1360559A/en not_active Expired
-
1973
- 1973-09-21 US US399598A patent/US3859478A/en not_active Expired - Lifetime
- 1973-10-29 AU AU61929/73A patent/AU6192973A/en not_active Expired
- 1973-11-08 BR BR8746/73A patent/BR7308746D0/pt unknown
- 1973-11-14 NL NL7315631A patent/NL7315631A/xx unknown
- 1973-11-16 CA CA186,005A patent/CA995349A/en not_active Expired
- 1973-11-20 CH CH1640273A patent/CH558626A/xx not_active IP Right Cessation
- 1973-11-22 IT IT31620/73A patent/IT1001915B/it active
- 1973-11-22 DE DE2358243A patent/DE2358243A1/de active Pending
- 1973-11-22 BE BE2053233A patent/BE807626A/xx unknown
- 1973-11-22 JP JP48130831A patent/JPS4984430A/ja active Pending
- 1973-11-22 AR AR251115A patent/AR199010A1/es active
- 1973-11-23 FR FR7341721A patent/FR2208266B3/fr not_active Expired
- 1973-11-23 AT AT982873A patent/ATA982873A/de not_active Application Discontinuation
- 1973-11-24 ES ES420820A patent/ES420820A1/es not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1360559A (en) | 1974-07-17 |
| BE807626A (nl) | 1974-05-22 |
| JPS4984430A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-08-14 |
| IT1001915B (it) | 1976-04-30 |
| CA995349A (en) | 1976-08-17 |
| US3859478A (en) | 1975-01-07 |
| FR2208266B3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1976-10-08 |
| CH558626A (de) | 1975-01-31 |
| FR2208266A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-06-21 |
| DE2358243A1 (de) | 1974-05-30 |
| NL7315631A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-05-28 |
| AR199010A1 (es) | 1974-07-31 |
| AU6192973A (en) | 1975-05-01 |
| ES420820A1 (es) | 1976-04-01 |
| ATA982873A (de) | 1976-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DK135480C (da) | Hovedmikrotelefon | |
| IT971692B (it) | Apparecchio auricolare | |
| BE793731A (fr) | Electrogenerateurs | |
| SE389253B (sv) | Hogtalare | |
| SE403917B (sv) | Inloppslada | |
| BE793764A (fr) | Integrerende weeginrichting | |
| AT324072B (de) | Wendelbohreb | |
| AT353108B (de) | Skibob | |
| BE790615A (fr) | Houderdrager | |
| SE398940B (sv) | Halvledardon | |
| AT323930B (de) | Untermatratze | |
| BE793718A (fr) | Aminobenzimidazoles | |
| BE793745A (fr) | Antistatische polystyreencomposities | |
| FI56769B (fi) | Haorbehandlingsmedel innehaollande nitrodifenylaminhaorfaerg | |
| BE791330A (fr) | Houderdrager | |
| AT323631B (de) | Schrägofen | |
| BR7308746D0 (pt) | Microfone de carvao | |
| AT322779B (de) | Bücherbrett | |
| AT335953B (de) | Lauterboden | |
| FI55402B (fi) | Elektrisk gensomstroemningsvaermeugn | |
| BE791976A (fr) | Sandalette | |
| BE789465A (fr) | Raamuitzetter | |
| ATA324376A (de) | Mikroskopokular | |
| BE782546A (fr) | Aansluitdoos | |
| BE779066A (fr) | Herenjas |