Invention Grant
- Patent Title: Telephone-exchange system
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Application No.: US27624328Application Date: 1928-05-09
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Publication No.: US1753338APublication Date: 1930-04-08
- Inventor: HAGUE ALFRED E , PETERSON GEORGE H
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Pfizer Inc
- Current Assignee: Pfizer Inc
- Priority: US27624328 1928-05-09
- Main IPC: H04M15/10
- IPC: H04M15/10
Information query
