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LEGO → System → Service Packs
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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).

External links

http://www.toysperiod.com/lego-set-reference/service-packs/lego-39-motor-gearbox/