Invention Grant
USB522537I5
失效
- Patent Title:
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Application No.: US52253774Application Date: 1974-11-11
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Publication No.: USB522537I5Publication Date: 1976-03-30
- Priority: US52253774 1974-11-11; GB3128773 1973-06-30; GB3128873 1973-06-30; GB4859274 1974-11-09; GB4859474 1974-11-09; GB5631172 1972-12-06; US42059673 1973-11-30
- Main IPC: B60B21/12
- IPC: B60B21/12 ; B60C15/02
Information query
