Invention Grant
- Patent Title: Automatic vacuum system
- Patent Title (中): 自动真空系统
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Application No.: US78854247Application Date: 1947-11-28
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Publication No.: US2522969APublication Date: 1950-09-19
- Inventor: SMITH PERRY C
- Applicant: RCA CORP
- Assignee: RCA Corp
- Current Assignee: RCA Corp
- Priority: US78854247 1947-11-28
- Main IPC: F04F9/08
- IPC: F04F9/08 ; H01J7/42 ; H01J9/385
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