c. 1910s; The Black-Clawson Co. - Hamilton, OH Antique lighted and reverse painted glass sign displaying the Black Clawson fourdrinier and press part. A fourdrinier is a machine used in the paper making process that forms the "webs" of paper from the pulp slurry. A press part then, as as the name would suggest, and presses any liquid from the slurry and is instrumental in attaining high paper quality. This signs features reverse painted graphics on a glass pane that is housed in a wooden frame that has a can attached the the back which houses the lighting hardware.