📁 机械

Mechanical puzzles are small objects that require manipulation to achieve some result. Examples would be a Rubik's Cube or a ball stuck in a 3D maze.

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Pipers Crisps

https://www.piperscrisps.com/

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Pickering, Corts and Summerson, Inc.

http://pcs-civil.com/

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PFA Consulting

http://www.pfaplc.com/

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Project Management Group

http://www.pmgroup-global.com/

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Patriot Clean Fuel

http://www.patriotcleanfuel.com/

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Pegasus Building Services

http://pegasusbuildingservices.com/

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ProSource

http://www.team-prosource.com/

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Physica E

http://www.elsevier.com/locate/physe

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Physica B

http://www.elsevier.com/locate/physb

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Physical Review B

http://prb.aps.org/

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