发明授权
US3623211A Method of framing a foil portion 失效
框架方法

Method of framing a foil portion
摘要:
IN ORDER TO FRAME A FOIL PORTION WITH A MIRROR SURFACE, A FOIL IS PERFORATED ALONG A CIRCULAR LINE, A MARGINAL ZONE OF THE FOIL IS FRICTIONALLY HELD WITHIN THE ENDLESS LINE, THE FOIL IS CUT ALONG THE ENDLESS LINE, AND THE MARGINAL ZONE IS FIRMLY CLAMPED AND MOVED OVER A FIRST FRAME PART AND TENSIONED, WHEREUPON A SECOND FRAME

PART IS PRESSED AGAINST THE FIRST FRAME PART AND CLAMPS THE TENSIONED FOIL TO THE FIRST FRAME PART WITHOUT ANY WRINKLES OF FOLDS.
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