专利名称：Method of making building panels and the
like
发明人：Raymond H. Pittman,William J. Schultz申请号：US06/877190申请日：19860623公开号：US04716645A公开日：19880105
摘要：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 oneof the faces of the sheet material resulting in a projection opposite the depression onthe opposite face protruding outwardly thereof and removing the projection to form anopening extending completely through the sheet material between said opposite faces.
申请人：MASONITE CORPORATION
代理机构：Mason, Kolehmainen, Rathburn & Wyss
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