Tetrad needle numbers T1ld, T1ls, 13, 33, 93s, 13D, 13S, 31, 31S, 31D, 33D, 33S, 93D, 93S, S855-DS73• Used In: Tetrad cartridges containing: 13D, 13S, 33D, 33S• Equivalent to these other universal replacement numbers: 409C73-1 409C731 409C73-2 409C732