Improvements in or relating to document cases of synthetic plastic sheet material

摘要

852,942. Filing papers ; tabs. LENNARTZ, W. Feb. 9, 1959 [Feb. 21, 1958], No. 4386/59. Classes 16 and 146(1), A document case of plastic sheet closed along two or three edges comprises a flap 2 bent over from one side and secured along a welded seam 3 to the opposite side 1, an extension 2SP1/SP of the flap being secured to the side 1 again along a welded seam 4 to form a pocket which car receive an interchangeable insert 5.