TLI

EDUCATIONAL ELECTRICAL CONTROL SYSTEM MODULES IN THE NATURE OF CUBICAL STRUCTURES CONTAINING ELECTRO-MECHANICAL COMPONENTS TO SIMULATE ENVIRONMENTAL CONTROL SYSTEMS IN A BUILDING OR FIELD ENVIRONMENT, FOR EXAMPLE, IN REFRIGERATION, VENTILATION, AIR CONDITIONING OR HEATING SYSTEMS, ALL SOLD TO THE PLUMBING AND PIPE FITTING TRADES AND VOCATIONAL-TECHNICAL SCHOOLS