Tariff classification of diagnostic laser imagers follows the residuary accessory heading where equipment serves machines under different headings.

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....Laser imagers that merely print diagnostic data received from other equipment lack independent diagnostic capability and are accessories rather than diagnostic instruments or apparatus. Chapter 90 Note 2(b) permits classification of an accessory with a machine only where it is solely or principally suitable for use with a particular kind of machine or machines under the same tariff heading. Because the imported laser imagers were compatible with equipment classifiable under both CTH 9018 and CTH 9022, they could not be classified with either group and fell under the residuary rule in Note 2(c). They were consequently classifiable under CTH 9033 00 00, not CTH 9018 90 19.....