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Single-phase condenser fan speed control for refrigerator and air conditioning units (terms considered too vague by the International Bureau - rule 13 (2) (b) of the Common Regulations); variable speed drive controls for HVAC and refrigerator units (terms considered too vague by the International Bureau - rule 13 (2) (b) of the Common Regulations); electronic pressure transducers for refrigerator and air conditioning units (terms considered too vague by the International Bureau - rule 13 (2) (b) of the Common Regulations). Thermostats; temperature controllers for refrigerators, freezers, walk- in coolers, HVAC systems, boilers, and cooling tower sump heaters; temperature sensors; humidity sensors; electric sensors; automatic pressure control instruments; pressure sensors; refrigerant leak detectors; electric relays; electrical transformers; automatic electric switches; solenoid valves; climate control systems consisting of a digital thermostat, pressure, and humidity controller for use with refrigeration systems, HVAC systems, and for industrial use; electronic controllers for refrigeration and HVAC systems.