Brick Special 1 x 4 with Groove #2653

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Hinged Brick

Brick Special 1 x 4 with 4 Studs on One Side #30414

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Hinged Brick

Technic Brick Special 2 x 2 with Pin Hole, with 2 Rotation Joint Sockets #48172-48461

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Hinged Brick

Hinge Brick 1 x 4 Locking with 1 Finger Vertical End and 2 Fingers Vertical End #30387-54661

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Hinged Brick

Technic Rotation Joint Ball Loop with Two Perpendicular Pins with Friction #47455