TT-I-521, FEDERAL SPECIFICATION: INK, COPYING AND RECORD (09-DEC-1930) [NO S/S DOCUMENT]

TT-I-521, FEDERAL SPECIFICATION: INK, COPYING AND RECORD (09-DEC-1930) [NO S/S DOCUMENT]., The copying and record ink covered by this specification is intended for writing permanent records. It can be used in fountain pens.