W-S-506B (AMENDMENT 1), FEDERAL SPECIFICATION: SPARK PLUG (15 JUN 1977) [NO S/S DOCUMENT]

W-S-506B (AMENDMENT 1), FEDERAL SPECIFICATION: SPARK PLUG (15 JUN 1977) [NO S/S DOCUMENT]., This amendment, which forms a part of Federal Specification W-S–506B, dated June 15, 1977, was approved by the Commissioner, Federal Supply Service, General Services Administration, for use of all Federal agencies.