00341nam a2200145 4500 2138 20181127164625.0 621.8 O132m 1964 O'Brien Robert. Machines / Robert O' Brien New York : Time-Life Books, 1964. 200 p. Simple machines. 1682 1682 0 0 ddc 0 0 MAIN RTCLIB RTCLIB MAIN 1748 0 621.8 OBR 30003264 2018-11-27 00:00:00 2018-11-27 MAIN