apparatus and instruments for incubation and microscopic observation, not for use during the course of medical operations, namely, microplates for laboratory use; gas mixers for laboratory use; apparatus and instruments for temperature control during microscopic observation, namely, heating apparatus in the nature of a temperature controller used in conjunction with microscopes to control the temperature of specimens being viewed

apparatus and instruments for humidity control during microscopic observation, namely, humidifier and dehumidifier apparatus to be used in conjunction with microscopes to control the humidity of the specimens being viewed