Air analysis apparatus; Alarm installations and alarms; Apparatus and instruments for weighing; Apparatus for testing gas, liquids and solids; Automated valves for indicate purpose or type of machine; Automatic fluid-composition control machines and instruments; Cable and wiring plates in the nature of protective sheaths for electrical cable and wiring; Cable connectors; Circuit breakers and circuit closers; Circuit overload protector devices; Current transformers; Demagnetizers for demagneti...