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physical object > artifact > device > instrument > optical device > detector > microphotometer

microphotometer
subject			fact

microphotometer	has definition A device for measuring the variations in density in a photographic emulsion.
	is a kind of detector
instrument	has operator
artifact	has creator
	has creation date
	has purpose
	has owner
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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