This Agreement relates to the entire business of each of the parties hereto in incandescent lamps, as hereafter defined. For the purpose of this Agreement the incandescent lamp is defined as comprising all electric lamps for illuminating, heating or medical purposes, operating by any or all of the following methods: incandescence of a refractory filament, luminescence of gas, cathode incandescence (except so called arc or enclosed arc-lamps, not operating in a sealed container, and also excepting Neon, X-Ray and Radio tubes), and all of the aforesaid are hereinafter comprehend by the word lamps.[...]