PRODUCTION AND LABORATORY EQUIPMENT FOR THE CHEMICAL MACHINING OF WORK PIECES, THE MAKING OF PRINTED CIRCUITS AND THE MAKING OF PRINTING SURFACES AND ENGRAVINGS-NAMELY, CONVEYORIZED ETCHERS; BENCH-TYPE ETCHERS; APPARATUS FOR RINSING WORK PIECES; NEUTRALIZING APPARATUS; STRIPPING APPARATUS; BRIGHTENING APPARATUS; ETCHANT REGENERATION APPARATUS; BATCH ETCHERS; SPRAY ETCHERS; DOUBLE-SIDED SPRAY ETCHERS; SINGLE-SIDED SPRAY ETCHERS; PRINTED CIRCUIT ETCHERS; RESIST REMOVERS; PRECLEANING APPARATUS; POST-CLEANING APPARATUS; DRIERS FOR ETCHING EQUIPMENT; PHOTOPRINTERS FOR PRODUCTION OF IMAGES ON WORK PIECES; DEVELOPERS; RESIST STRIPPERS; COMBINATION SPRAY RINSE AND RESIST STRIPPING APPARATUS; RE-EXPOSURE APPARATUS; BRUSH-RESIST REMOVERS; RINSING APPARATUS; COMBINATION BRIGHTENER, RINSE AND COATING APPARATUS; CONTROL APPARATUS; AND DELIVERY AND CIRCULATION PUMPS, AND PARTS AND PIECES FOR SUCH GOODS