An advertisement for Acid Pumps that are made out of hard rubber.
A black and white advertisement for American Hard Rubber Co advertising acid pumps.
Acid Pumps are displayed on this old time advert.
A sign is advertising 'Acid Pumps Piping and Fittings', made by the American Hard Rubber company.
An older ad that says Acid Pumps Piping and Fittings on it.