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LEGO® Motor History
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Lego 9V Technic Motors compared characteristics
LEGO 9V Technic Motors compared characteristics
LEGO 9V Technic Motors compared characteristics
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LEGO 8735: Motor Set, 9V | Brickset: LEGO set guide and database
LEGO part 71427c01 - Light Gray Electric, Motor 9V Mini-Motor, older heavier weight at BrickScout
