B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 13/06 (2006.01) B21D 5/06 (2006.01)
Patent
CA 2056872
ABSTRACT An improved method of and apparatus for forming sheet material into compound curves by drawing, in which critical positioning, dimensioning and relative curvatures of forming bead stages are provided for such curvatures as sectors of paraboloidal antenna reflectors and other compound curve sheets.
Creaser Charles
Johnson Ray C.
Chu Associates Inc.
Creaser Charles
Johnson Ray C.
Macrae & Co.
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