United States Patent 3125875
US Patent References:
/0795882.html
- - 0795882

/0807779.html
- - 0807779

/0832420.html
- - 0832420

Safety door chain
- - 2966053


Publication Date:
03/24/1964
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Primary Class:
70/93
Other Classes:
292/264
International Classes:
E05C17/36; E05C17/00
Foreign References:
GB191206448A
DE302661C