Calculating Machines; Pocket Calculators; Electrochemical Storage Cells-Namely, Fuel Cells, Electric Cells and Batteries; Battery Chargers; Telemetering Apparatus; Ammeters; Luminous Switches; Voltmeters; Barometers; Thermometers; Emergency (Life Saving) Devices and Instruments-Namely, Distress Signals, Remote Alarms; Optical Devices and Instruments-Namely, Microscopes, Lenses, Spectacles and Slide Viewers; Photographic Apparatus and Structural Parts Thereof-Namely, Exposure Elements, Drop Shutters and View Finders; Projectors and Structural Parts Thereof; Phonographs and Structural Parts Thereof; Radio Transmitters, Receivers and Structural Parts Thereof, Cassettes, Cartridges, Wireless Transmission Instruments-Namely, Amplifier Tubes; Electric Lighters; Electric Gas Lighters; Electric Fences; Electric Portable Vacuum Cleaners for Domestic Use