Fifty years of progress : a sketch portraying with pen and brush the past and present of a successful business (1898)
William Mann Company · Philadelphia : W. Mann Co. · leaf 63
the old style of perforators, wherein the weight of a man upon a treadle was required to effect the perforations. In these new patterns of machines a slight touch upon a treadle releases a pin, which causes the depression of the head carrying the perforators to be actuated by power. Checks, notes,… … 5Ji
William Mann Company · Paper industry -- Pennsylvania -- Philadelphia -- History · Stationery trade -- Pennsylvania -- Philadelphia -- History · Printing industry -- Pennsylvania -- Philadelphia -- History · Blank-books -- History
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
