Method of making building panels and the like

Details Method of making building panels and the like Method of making building panels and the like

1986-06-23

1988-01-05

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

29414, 51324, 83 17, 83920, B26F 100, B26F 300

Patent

active

047166452

ABSTRACT:
A new and improved method of making an opening extending between opposite faces of thin sheet material comprises the steps of forming a depression in one of the faces of the sheet material resulting in a projection opposite the depression on the opposite face protruding outwardly thereof and removing the projection to form an opening extending completely through the sheet material between said opposite faces.

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