TT-I-521A, FEDERAL SPECIFICATION: INK, COPYING AND RECORD (20-MAY-1959) [USE TT-I-00521A (AMENDMENT-1) IN LIEU OF TT-I-521] [NO S/S DOCUMENT]

TT-I-521A, FEDERAL SPECIFICATION: INK, COPYING AND RECORD (20-MAY-1959) [USE TT-I-00521A (AMENDMENT-1) IN LIEU OF TT-I-521] [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.