'(<a href="http://www.j-archive.com/media/2006-11-06_J_26.jpg" target="_blank">Jon of the Clue Crew indicates a drawing on the monitor.</a>) In Edison's light bulb patent, m represents the tube leading to a pump that creates one of these in the glass bulb'
a vacuum
EDISON'S PATENTS: In Edisons light bulb patent, m represents the tube leading to a pump that creates one of these in the glass bulb
In Edison's light bulb patent, m represents the tube leading to a pump that creates one of these in the glass bulb
In Edison's light bulb patent, m represents the tube leading to a pump that creates one of these in the glass bulb
EDISON'S PATENTS
a vacuum
EDISON'S PATENTS