Thread tension devices
United States Patent 2937605
US Patent References:
/0383748.html
- - 0383748

/0413657.html
- - 0413657

/0875610.html
- - 0875610

Thread-tension device for sewing machines
- - 2462812

Thread tensioning device for sewing machines
- - 2810532


Inventors:
Dunn, Earl F.
Sliva, Stanley M.
Walling, Francis L.
Publication Date:
05/24/1960
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Assignee:
SINGER MFG CO
Primary Class:
112/254
Other Classes:
242/155R
International Classes:
D05B47/00
Foreign References:
IT414717B