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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
F16N 17/02

at high temperature (of turbines F01D, F02C; lubrication of machines or engines in general, of internal-combustion engines F01M)

Full Title

Lubrication of machines or apparatus working under extreme conditions (additives to lubricating oil or lubricating grease C10M) > at high temperature (of turbines F01D, F02C; lubrication of machines or engines in general, of internal-combustion engines F01M)