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Priority to ES0272850ApriorityCriticalpatent/ES272850A2/en
Publication of ES272850A2publicationCriticalpatent/ES272850A2/en
Some improvements-introduced in the main patent No. 267.066, by "Some improvements in speargun spearguns for submarine use", characterized by disposed in the reserve chamber pistol, a valve for the insufflation of air from the outside and a device piston longitudinally adjustable by means of an external knob, varying the capacity of said reserve chamber and therefore the air pressure contained, whose piston device is guided in a rectilinear manner and is driven by a threaded pin that rotates while remaining axially fixed . (Machine-translation by Google Translate, not legally binding)
ES0272850A1961-11-211961-11-21Some improvements in the submarine lancearpet pistlets (Machine-translation by Google Translate, not legally binding)
ExpiredES272850A2
(en)