Electronic sensors for sensing the presence of a gas in a liquid; electronic gas and liquid sensors and monitors; gas regulators; electronic gas and liquid flow control instruments; electronic oil level sensors for compressors and other oil operated or lubricated machines and apparatuses; refrigeration monitoring instruments, including for monitoring the loss of refrigerant

'apparatus':43 'compressor':34 'control':27 'electron':1,13,22,29 'flow':26 'gas':9,14,20,23 'includ':47 'instrument':28,46 'level':31 'liquid':12,16,25 'loss':51 'lubric':40 'machin':41 'monitor':19,45,49 'oil':30,37 'oper':38 'presenc':6 'refriger':44,53 'regul':21 'sens':4 'sensor':2,17,32

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