Bobbin-thrfad pull-off for lock-stitch machines
United States Patent 1792237

Inventors:
Nelson, Parkes William
Publication Date:
02/10/1931
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Assignee:
SINGER MFG CO
Primary Class:
112/184
International Classes:
D05B57/14; D05B73/12; D05B57/00; D05B73/00