CPC Main Group G01N 1/00 Sampling; Preparing specimens for investigation 3 direct subcodes Child Classifications Navigate with arrow keys, Enter to open G01N 1/02 Devices for withdrawing samples G01N 1/28 Preparing specimens for investigation (mounting specimens on microscopic slides G02B21/34; means for supporting the objects or the materials to be analysed in electron microscopes H01J37/20 ) G01N 2001/002