The Singer Manufacturing Company.
List of parts, machines numbers 51W55, 51W56 and 51W57. Form 2043W, revised Nov. 1949.
R651906. List of parts, machines numbers 51W55, 51W56 and 51W57. Form 2043W, revised Nov. 1949. By The Singer Manufacturing Company. NM: plates. © 23Dec49; AA137566. The Singer Company (PWH); 24Jan77; R651906.
The Singer Company|PWH