作者: Benjamin F. Astell
DOI:
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摘要: A device for removably fastening a picture to board or the like is disclosed. The includes frame which defines an opening holding picture, having front and back face, top bottom edge first second side. fastener disposed between face of board, end, end defining engaging portion pressing into board. head cooperates with frame. arrangement such that in use device, when has been inserted frame, fastened by