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Electric, Light 2 x 2 Clip-On Plate with Blue Circle and White Arrow Pattern
Bricklink ID:2384pb06
Weight:0.400 g
2384pb06

Sets with this part (from Bricklink)
  Part color Milky White
 


 Set nameRelease yearQuantity
50305030 signs for use with lighting bricks19931
846846 Lighting Bricks19931
64816481 Light & Sound Construction Crew19891