GB190020797A - Improvements relating to Sound-magnifying Appliances for Telephones, Phonographs, and the like - Google Patents
Improvements relating to Sound-magnifying Appliances for Telephones, Phonographs, and the likeInfo
- Publication number
- GB190020797A GB190020797A GB190020797DA GB190020797A GB 190020797 A GB190020797 A GB 190020797A GB 190020797D A GB190020797D A GB 190020797DA GB 190020797 A GB190020797 A GB 190020797A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phonographs
- telephones
- sound
- improvements relating
- magnifying
- 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
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB190020797T | 1900-11-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB190020797A true GB190020797A (en) | 1901-03-30 |
Family
ID=43800613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB190020797D Expired GB190020797A (en) | 1900-11-17 | 1900-11-17 | Improvements relating to Sound-magnifying Appliances for Telephones, Phonographs, and the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB190020797A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2458038A (en) * | 1942-08-29 | 1949-01-04 | Rca Corp | Acoustical apparatus |
-
1900
- 1900-11-17 GB GB190020797D patent/GB190020797A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2458038A (en) * | 1942-08-29 | 1949-01-04 | Rca Corp | Acoustical apparatus |
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