cleaning machines using dry ice for maintenance purposes, including pelletizers that convert gaseous carbon dioxide into pellets of solid carbon dioxide, insulated containers for the pellets, and blasters that use compressed air to accelerate the solid carbon dioxide pellets through a gun onto a surface to be cleaned; and replacement parts for the foregoing

'acceler':34 'air':32 'blaster':28 'carbon':14,20,37 'clean':1,48 'compress':31 'contain':23 'convert':12 'dioxid':15,21,38 'dri':4 'forego':54 'gaseous':13 'gun':42 'ice':5 'includ':9 'insul':22 'machin':2 'mainten':7 'onto':43 'part':51 'pellet':10,17,26,39 'purpos':8 'replac':50 'solid':19,36 'surfac':45 'use':3,30

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