Title:
Mouthpiece protector
United States Patent 3217708
US Patent References:
Respirator
- - 1674336

Mouth prop
- - 2220674

Mouthpiece
- - 2590118

Apparatus for synthesis of organic compounds
- - 2699988


Inventors:
Roberts, Shephard D.
Publication Date:
11/16/1965
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Assignee:
Roberts, Shephard D.
Primary Class:
128/861
Other Classes:
600/237
International Classes:
A63B71/08