this partial view the mechanism |
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| navigate by keyword : abstract appliance cog device dirty drive equipment gear gearing grease hole industrial industry inside iron lubricate lubricated lubricating lubrication machine machinery maintenance mechanical mechanism metal oil oiled old out part pinion residue service shaft steel tapped technical technology threaded tool torque used wheel worn |
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| Worn grease can be seen inside the cog wheels unit. This is a partial view of the transmission mechanism from the crank to the chuck of an old hand drill |
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