GB308449A - Improvements relating to telephone instruments - Google Patents
Improvements relating to telephone instrumentsInfo
- Publication number
- GB308449A GB308449A GB727528A GB727528A GB308449A GB 308449 A GB308449 A GB 308449A GB 727528 A GB727528 A GB 727528A GB 727528 A GB727528 A GB 727528A GB 308449 A GB308449 A GB 308449A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reinforced
- strips
- improvements relating
- powdered
- telephone instruments
- Prior art date
- 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
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 abstract 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 229920001800 Shellac Polymers 0.000 abstract 1
- 229940072049 amyl acetate Drugs 0.000 abstract 1
- PGMYKACGEOXYJE-UHFFFAOYSA-N anhydrous amyl acetate Natural products CCCCCOC(C)=O PGMYKACGEOXYJE-UHFFFAOYSA-N 0.000 abstract 1
- 229920002678 cellulose Polymers 0.000 abstract 1
- 239000001913 cellulose Substances 0.000 abstract 1
- 239000004568 cement Substances 0.000 abstract 1
- MNWFXJYAOYHMED-UHFFFAOYSA-M heptanoate Chemical compound CCCCCCC([O-])=O MNWFXJYAOYHMED-UHFFFAOYSA-M 0.000 abstract 1
- 235000011837 pasties Nutrition 0.000 abstract 1
- 239000008262 pumice Substances 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 abstract 1
- 229940113147 shellac Drugs 0.000 abstract 1
- 235000013874 shellac Nutrition 0.000 abstract 1
- 239000004208 shellac Substances 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
- 239000011787 zinc oxide Substances 0.000 abstract 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE358487D BE358487A (enrdf_load_stackoverflow) | 1928-03-08 | ||
| GB727528A GB308449A (en) | 1928-03-08 | 1928-03-08 | Improvements relating to telephone instruments |
| FR670618D FR670618A (fr) | 1928-03-08 | 1929-02-28 | Organes vibrants particulièrement destinés aux microphones, hauts parleurs et autres dispositifs analogues |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB727528A GB308449A (en) | 1928-03-08 | 1928-03-08 | Improvements relating to telephone instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB308449A true GB308449A (en) | 1929-03-28 |
Family
ID=9829965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB727528A Expired GB308449A (en) | 1928-03-08 | 1928-03-08 | Improvements relating to telephone instruments |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE358487A (enrdf_load_stackoverflow) |
| FR (1) | FR670618A (enrdf_load_stackoverflow) |
| GB (1) | GB308449A (enrdf_load_stackoverflow) |
-
0
- BE BE358487D patent/BE358487A/xx unknown
-
1928
- 1928-03-08 GB GB727528A patent/GB308449A/en not_active Expired
-
1929
- 1929-02-28 FR FR670618D patent/FR670618A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE358487A (enrdf_load_stackoverflow) | |
| FR670618A (fr) | 1929-12-02 |
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