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I've got 6 or 8 white 2x4 bricks. But they seem to be rather old as there is a "Pat. Pending" on it and also a "C5".

They also have one small hole on each of its sides (but none on top) and the interior is transparent.

Does anyone know from which set this comes?

view from underside

Essi
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1 Answers1

11

This is Brick, Modified 2 x 4 with Wheels Holder, Trans-Clear Bottom. White colored version was included in 77 sets.

Alex
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