United States Patent 2899693
Publication Date:
08/18/1959
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Primary Class:
Other Classes:
160/DIG.015, 5/187
International Classes:
A61G1/013; A61G1/052; A61G1/00
Foreign References:
| FR9045E | ||||
| CH134213A | ||||
| GB432690A | ||||
| DE660152C | ||||
| FR693352A | ||||
| DE743941C | ||||
| FR851702A |