Title:
PROTECTIVE HELMET
United States Patent 3500475
Inventors:
Otsuka, Norimoto
Publication Date:
03/17/1970
Export Citation:
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Assignee:
HONDA GIJUTSU KENKYUSHO KK
Primary Class:
2/421
Other Classes:
2/425
International Classes:
A42B3/32; A42B3/32; (IPC1-7): A42B3/02
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US Patent References:
3344433Crash helmet
3239842Safety helmet
3213463Safety helmet and headband therefor
3190973Rigid shell helmet and rigging and sound attenuating means therefor
3116490Safety helmet having a semi-flexible liner
2688747Plastic helmet
2248366Safety hat




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