| Description | Pack 4 . 8 News Release Development Electroplating Equipment, dated 1975 C/19/2-8 Sentinel Filters information sheet, dated 1975 C/19/3-8 Thyristor Controlled Rectifiers information sheet, type 7789, dated 1975. C/19/4-8 DC Digital Ampere Time Meters information sheet, dated 1975 C/19/5-8 Silica Cased Electric Immersion Heaters information sheet, dated 1975 C/19/6-8 Metal Cased Electric Immersion Heaters information sheet, type 9174, dated 1975 C/19/7-8 Constant Level Salt Spray Corrosion Test Cabinet information sheet, type 7817, dated 1975. C/19/8-8 Constant Level Salt Cass Corrosion Test Cabinet information sheet, type 7818, dated 1975. |