The Singer Manufacturing Company.
Instructions for using Singer sewing machines 51W56 and 51W57 (oblique underedge trimmer) and 51W59 (horizontal underedge trimmer) Form 1971W (rev. 547)
R594401. Instructions for using Singer sewing machines 51W56 and 51W57 (oblique underedge trimmer) and 51W59 (horizontal underedge trimmer) Form 1971W (rev. 547) By The Singer Manufacturing Company. NM: new illus. & text. © 18Sep47; AA63928. The Singer Company (PWH); 2Jan75; R594401.
The Singer Company|PWH