Invention Grant
- Patent Title: Method of punching out metal
- Patent Title (中): 冲出金属的方法
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Application No.: US69816746Application Date: 1946-09-20
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Publication No.: US2508758APublication Date: 1950-05-23
- Inventor: CHARLES HOLLERITH
- Applicant: HAYES IND INC
- Assignee: Hayes Ind Inc
- Current Assignee: Hayes Ind Inc
- Priority: US69816746 1946-09-20
- Main IPC: B21D28/16
- IPC: B21D28/16
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