Electrical transducer; Electronic components in the nature of infrared detectors for use in further manufacture; Electronic detectors for observing and measuring the infrared spectrum, namely, infrared detectors; Filters for optical devices; Fire and smoke detectors; Gas sensors for measuring gas concentration; Infrared detectors for use in military, law enforcement, civil, scientific and industrial applications; Liquid level sensors; Proximity sensors; Sensors for the determination of temper...

Electrical and scientific apparatus