LITHOGRAPHIC PLATE PREPARATION MATERIALS-NAMELY, AGENTS FOR ETCHING, STAGING OUT, COATING, DEVELOPING, COPPERIZING, CLEANING, AND CORRECTING SUCH PLATES IN PREPARATION FOR PRINTING AND FOR MAINTAINING DISTINCTIVENESS BETWEEN PRINTING AND NON-PRINTING AREAS ON THE SAME DURING PRINTING

'agent':7 'area':34 'clean':15 'coat':12 'copper':14 'correct':17 'develop':13 'distinct':27 'etch':9 'lithograph':1 'maintain':26 'materi':5 'materials-nam':4 'name':6 'non':32 'non-print':31 'plate':2,19 'prepar':3,21 'print':23,29,33,39 'stage':10

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