JIS D4503:1985 pdfダウンロード。Windscreen Defrosting Systems for Trucks and Buses 1.scope This Japanese Industrial Standard specifies the defrosting performances and their testing methods of the windscreen defrostingsystems，hereinafter，referred to as the “defrosters” for the trucksor buses specified in JIS D 0101. Further，this standard may apply to the mechanisms same as trucks andbuses. Remark:In this standard，numerical values and units given in { } are in accordance with the Internationa1 System of Units(sI). 2.Definitions (1)For the purposes of this standard，the fo11owing definitions apply:(1)defrostThat operation which melts frost or ice covering the exterior surface of a day1ight opening,unti1 it becomes transparent or semitransparent state. (2)day1ight...