Abstract: An electric heater is silk screened on an interior surface of a cellulose diacetate visor by applying silk screening ink through a silk screen mask to a flat cellulose diacetate blank. The ink is then dried by being heated to between 120.degree. F.-150.degree. F. for about 20 seconds, preferably by air jet drying. The cellulose diacetate sheet is then formed into visor shape and cured by heating in an oven at about 325.degree. F. for about 20 minutes on a drape and/or vacuum form. The temperature of the visor during the drying, as well as bending and curing stages, is carefully controlled to assure proper application of the ink as well as the mechanical integrity and transparency of the visor.

Abstract: A face mask used by a firefighter and/or miner includes a seal between the mask interior surfaces and skin on the face of a user. A port on the sealed visor receives a hose for supplying a regulated amount of air from a compression air tank carried by the user. A portion of the mask in the form of a visor covering the eyes of the user is transparent to visible optical energy. The mask has a tendency while used to have condensate formed thereon, causing the transparent portion to be fogged. An electrically activated device in the form of a heater and/or fan, on the mask prevents formation of and/or removes the condensate. A battery in a housing carried by the user activates the electrically activated device. The housing includes heat insulation to prevent the battery from being damaged by high temperatures in the vicinity of the user. The power supply for the transparent visor energizes a temperature sensor for enabling a firefighter to be warned that he/she is in an unsafe, excessively hot environment, i.e.

Abstract: Condensed breath vapor is removed from visors on helmets adapted to be used by drivers of open air outdoor vehicles, such as snowmobiles, motorcycles, and all terrain vehicles, by applying electric current to a resistance heater coil on the visor. The heating coil is electrically connected to a connector mounted on the visor. The connector is electrically connected by a helically coiled cable to an assembly mounted on the vehicle dashboard. The assembly includes a female jack for receiving a male jack at the end of the coiled helical cable. The assembly also includes a switch for connecting the jack to a power supply of the vehicle, so that electric energy from the power supply can be coupled selectively to the female jack at two power levels.