Machines for working sheet metal
United States Patent 3174322
US Patent References:
/1326852.html
- - 1326852

Apparatus for crushing corrugated metal
- - 1462474

Apparatus for forming plates
- - 2289150

Shingle forming machine
- - 2975818


Inventors:
William, Cookson
Publication Date:
03/23/1965
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Assignee:
COOKSON SHEET METAL DEV LTD
Primary Class:
72/324
Other Classes:
72/319, 72/403
International Classes:
B21D13/02; B21D39/02; B21D13/00