Lubricated pulley.jpg
United States Patent Office
en
Lubricated pulley, Self-lubricating pulley invention
commons
en
Lubricated pulley, United States patent drawings
commons
ja
潤滑滑滑車、自己潤滑滑滑車発明
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ja
潤滑滑滑車、米国特許図面
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lubricated lubricate lubrication