Device for automatic control of air pressure in a closed compressor pipeline

A device for automatic control of air pressure in a closed compressor pipeline: No. 23438. Supponent.07/18/1911.Issue 02/28/1913 / J. Dunlop.- [B.M .: B. and., 1913].-[2] p., 1 l.Il .. -Description of the device for automatic control of air pressure in a closed compressor pipeline.To the privilege of a foreigner J. Dunlop, in Glasgow, in Scotland, declared on July 18, 1911 (og. St. No. 48881).Class 27. No. 23438. The privilege issued on February 28, 1913..I. Dunlop, J..1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS