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The 3M 131 Traffic Light

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This is a Lego made version of the 3M 131 traffic light. The first production of this signal was from 1969 to 2007. The 3M 131 used a PAR 46 lamp, similar to cars at that time. The 2007 version consisted of minor changes, including the photocell dimmer wiring resitsor changed. This lego build took 3 days to make, and took a lot of effort.

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