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Closeup of the 3M section
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This is just a basic closeup on the yellow section of the 3M signal. I have removed the wire shield in this picture to reveal the electrical terminations. In the back of the signal are the two lenses, the frosted diffuser mounted over a clear optical limiter that actually has the programming tape on it. Each section is interconnected, and has it's own connection block, and the field wire hook up is in the bottom section. The device to the left of the block is a photocell that dims/brightens the lamp.
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