74LS153 Dual 4-To-1 Multiplexer

Spec Sheet
74LS153_E11_12_13

Motorola

From a photo of Rev. 0 board 1070 (A2S1-0800), near locations E11, 12 and 13. There is also one near location C1.
SN74LS153N, 7723 date code.
Total # on board: 4.