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102-1 4.5V Motor Set Reviews - Brick Insights
Lego Technic 4.5v Motor Set 870 (1977) and Gear Block Set 872 (1978) - YouTube
LEGO PART 6216a Motor, 4.5V Type 1 for 2-Prong Connectors without Middle Pin | Rebrickable - Build with LEGO
LEGO 107-1 4.5v Motor Set Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO® Motor History
BrickLink - Part bb0007c01pb02 : LEGO Electric, Motor 4.5V Type A 12 x 4 x 4 (Train) with White '4,5 V.' Pattern [Electric, Motor] - BrickLink Reference Catalog