Doug Engel

Put-together / Wood

Designer: Doug Engel

Maker: General Symmetrics, Inc (Doug Engel)

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Tetrametric

Disassembly / Metal

Designer: Doug Engel

Maker: Bits and Pieces

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Solved

Trinity Infinity

Trinity Infinity

Disassembly / Metal

Designer: Doug Engel

Maker: Bits and Pieces

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Solved

Tube Box Puzzle

Tube Box Puzzle

Put-together / Wood

Designer: Doug Engel

Maker: General Symmetrics, Inc (Doug Engel)

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Turnstile

Sequential Movement / Plastic

Designer: Doug Engel

Maker: Binary Arts

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Solved

Yin and Yang

Interlocking / Metal

Designer: Doug Engel

Maker: Bits and Pieces

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Solved

Yin and Yang (Wooden)

Yin and Yang (Wooden)

Interlocking / Wood

Designer: Doug Engel

Maker: multiple manufacturers

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Solved