Flowering drilling instrument

Free falling drilling instrument: No. 11778. Declared.10/26/1902.Issues on 02/28/1907 / "Brothers Nobel".- [B.M .: B. and., 1907].-[1] p., 1 l.Il .. -Description of a freely falling drilling tool.To the privilege of the Nobel brothers' oil production partnership, in the city of St. Petersburg, declared on October 26, 1902 (ocher St. No. 18895).Group I. No. 11778. April 29, 1907Ex.: With a handle.litter..I. Partnership of the oil production of the Nobel brothers (St. Petersburg) .1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS