Invention Grant
- Patent Title: Interchangeable mechanical-sign unit.
- Patent Title (中): 可交换机械单元。
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Application No.: US9334016Application Date: 1916-04-19
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Publication No.: US1257348APublication Date: 1918-02-26
- Inventor: HELLER HERMAN S
- Applicant: HELLER HERMAN S
- Assignee: Herman S Heller
- Current Assignee: Herman S Heller
- Priority: US9334016 1916-04-19
Information query
