26 CRYOGENIC APPLIANCES AND PARTS THEREOF AND INSTRUMENTS AND ACCESSORIES FOR USE THEREWITH-NAMELY, CRYOGENIC DEWARS, CRYOSTATS, LIQUID LEVELCONTROLLERS FOR CRYOGENIC FLUIDS, CRYOGENIC FLUID TEMPERATURE SENSING, MEASURING AND FLOW CONTROLLING INSTRUMENTS FOR SENSING THE TEMPERATURE OF AND CONTROLLING THE FLOW OF CRYOGENIC FLUIDS, AND INSULATED CRYOGENIC CONDUITS AND PLUMBING FIXTURES