G PHYSICS
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G01 MEASURING; TESTING
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G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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G01M15/00 Testing of engines
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G01M15/04 Testing internal-combustion engines
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G01M15/10 by monitoring exhaust gases; or combustion flame
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G01M15/102 by monitoring exhaust gases
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G01M15/104 using oxygen or lambda-sensors
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