1920 Article Patent Phonograph Clock Magnet Spark Plug Reading Light Compass SI1 MIX9 Hengeler taught as a professor

Hengeler taught as a professor at the Academy of Fine Arts in Munich

Keywords specific to this image: French

right side

"Half Dome and Cloud's Rest

Keywords specific to this image: Ornate Architecture

1920 Article Patent Phonograph Clock Magnet Spark Plug Reading Light Compass SI1 MIX9 Hengeler taught as a professorThis is an original 1920 one page article (one single sided page) of the latest patents of the time. Shown is the multi record phonograph, the phonograph vibration device, an oxygen and hydrogen generator, an electrically driven clock, a controlling field of magnets, a reading light, an electric oven, a spark plug tester, colored moving pictures and a magnetic compass. CONDITION This 91+ year old Item is rated Near Mint Very Fine. Light aging