Protective mouthpiece
United States Patent 2847003
US Patent References:
Tooth guard
- - 2521039


Inventors:
Helmer, Norman D.
Easton, Fred H.
Publication Date:
08/12/1958
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Assignee:
Helmer
Primary Class:
128/861
Other Classes:
2/424, 2/9
International Classes:
A63B71/08