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800g keg general grease excavator loader butter construction machinery friction parts lubrication anti-rust

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80*60*15 square 4-hole brake pad slitting machine rewinder brake friction plate

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Friction electrification scientific experiment diy technology small production electrostatic demonstration material package steam Classroom Manual

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Maxwell rolling pendulum stem technology small production diy physical experiment gravity model popular science equipment wholesale

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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Frictional electrification science experiment diy technology small production electrostatic demonstration material package steam classroom manual

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Frictional electrification science experiment diy technology small production electrostatic demonstration material package steam classroom manual

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