From this period onwards, Lemelson received an average of one patent a month for more than 40 years, in technological fields related to automated warehouses, industrial robots, a talking thermometer ( for the blind ), cordless telephones, computer controlled spraying robots, fax machines, videocassette recorders, heat-sealing machine, illuminated highway makers, patient monitoring systems, camcorders, and the magnetic tape drive used in Sony's Walkman tape players.
