Stitch forming mechanism for buttonhole sewing machines
United States Patent 1966432

Inventors:
Allen, Edward B.
Knox, Maurice D.
Publication Date:
07/17/1934
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Assignee:
SINGER MFG CO
Primary Class:
112/181
Other Classes:
112/228
International Classes:
D05B3/08; D05B57/00; D05B73/12; D05B3/00; D05B73/00