Radiation monitors in the nature of radon monitors with electrets, reference electrets, electric voltage meters, electric holders and chambers, pre-recorded DVDs and CDs featuring operators' manuals for radiation monitors, field-analysis software programs for use with radiation monitors, and courseware in the nature of educational software featuring instruction in the field of radiation monitors

'analysi':34 'cds':25 'chamber':19 'coursewar':43 'dvds':23 'educ':48 'electr':13,16 'electret':10,12 'featur':26,50 'field':33,54 'field-analysi':32 'holder':17 'instruct':51 'manual':28 'meter':15 'monitor':2,8,31,41,57 'natur':5,46 'oper':27 'pre':21 'pre-record':20 'program':36 'radiat':1,30,40,56 'radon':7 'record':22 'refer':11 'softwar':35,49 'use':38 'voltag':14

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