Vintage circa 1940 art deco style postcard advertising the Tungsram radio tube and light bulb manufacturer of Hungary. In business since 1896, Tungsram was awarded a patent for electric bulbs with a tungsten filament in 1903. Later in 1934, they also announced a patent for an electric bulb filled with krypton. Both provided a longer lifetime for electric bulbs. (Source: Wikipedia)
No comments:
Post a Comment