9 SCIENTIFIC, NAUTICAL, SURVEYING AND ELECTRICAL APPARATUS AND INSTRUMENTS (INCLUDING WIRELESS), PHOTOGRAPHIC, CINEMATOGRAPHIC, OPTICAL, WEIGHING, MEASURING, SIGNALLING, CHECKING (SUPERVISION), LIFE-SAVING AND TEACHING APPARATUS AND INSTRUMENTS; COIN OR COUNTERFREED APPARATUS; TALKING MACHINES; CASH REGISTERS; CALCULATING MACHINES; FIRE EXTINGUISHING APPARATUS