INSTRUMENTS AND APPARATUS FOR THE COMBINED DETECTION OF THE PRESENCE OF EXPLOSIVE CONDITIONS AND FOR SUPPRESSING OR MITIGATING EXPLOSIONS AND COMPONENT PARTS THEREOF; AND FIRE INDICATING INSTRUMENTS, TEMPERATURE INDICATORS AND TEMPERATURE REGULATORS AND PARTS THEREOF

Portable Hand Fire Extinguishers, Installed Fire Extinguishing Systems for Aircraft, Etc., and Comprising Containers Connected to Piping with Suitable Nozzles, Cocks Switches, Etc.[ , and Parts for Internal Combustion Engines Exclusive of Packings, Gaskets, Hose, and All Ignition Parts ]

Electric Switches (Ordinary) and Parts of Electric Switches Made of Ordinary Metal