Machines used in oil field operations, namely, oil drilling mud degassers, mechanical scavengers which remove oxygen from drilling mud in drilling operations, and vacuum pumps and blowers used in the degassing of drilling mud [ ; live fish bait aeration system comprised primarily of power-operated aerators being machines and also including bait tanks ]

'aerat':38,46 'also':50 'bait':37,52 'blower':27 'compris':40 'degass':11,31 'drill':9,18,21,33 'field':5 'fish':36 'includ':51 'live':35 'machin':1,48 'mechan':12 'mud':10,19,34 'name':7 'oil':4,8 'oper':6,22,45 'oxygen':16 'power':44 'power-oper':43 'primarili':41 'pump':25 'remov':15 'scaveng':13 'system':39 'tank':53 'use':2,28 'vacuum':24

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