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LEGO → System → Service Packs
38 << 39 >> 40 (1, 2284px-LEGO logo.svg.png

39 Motor Gearbox was a System Service Packs set released in 1977. It contained an OldGray 12 x 4 x 3 1/3 electric 4.5V/12V type II motor gearbox (Part x469bc).

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