broken transit instrument

meridian transit [instrument]

photoelectric transit instrument

transit [instrument]

transit instrument

~(13)N monitoring instrument

alarming instrument

alarm instrument

air-tight instrument

Airport instrument landing system

airphoto stereoscopic instrument

Aircraft Instrument

air-cored instrument

airborne instrument

Air-borne electronic instrument

air purification instrument

Air pump instrument

air pressure therapeutic instrument

Air operated control instrument

air monitoring instrument