gears small four stroke engine with oil traces and dirt |
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| navigate by keyword : small four stroke engine gears oil traces dirt close view gear wheel large cog wheels gearbox gearwheels cogwheel tooth gearwheel pinion spares metallic conceptual shine spare parts inside component rotate steel cooperation cogs connect precision technology transmission precious old metal manufacturing mechanics industry machinery equipment mechanism mechanical detail machine industrial motion motor joint factory engineering apparatus rusty pattern texture black background lubricarion strain |
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| close up view of gear wheel . Large cog wheels in the gearbox of engine . |
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