US1026328A
Telephone system.
Abstract
This record has no abstract on file.
Term
Term ended
Expired 14 May 1929, 97.4 years ago.
- Priority and filed
- Granted
- Expired
- Today
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| US8774093B2 | Cited by | United States of America | Applicant |
| US2962557A | Cited by | United States of America | Search report |
Numbers
- Application
- 645630
Titles
- English
- TELEPHONE SYSTEM.
Classification
- CPC, 1
- H04M9/00