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Priority to ES340309ApriorityCriticalpatent/ES340309A2/en
Publication of ES340309A2publicationCriticalpatent/ES340309A2/en
"Improvements in the Patent of Invention No. 309,881" relating to: "Improvements in digging machines", whose improvements, essentially are characterized by providing in the lower part of the general frame, and in proximity to its ends two fixed arms that descend vertically behaving each one of them, in its free ends a blade; said vertical arms having a pair of lug-like appendages, the first of which receives a bolt or turning point in which the end of an arm that includes a turning implement is adapted, allowing it to rotate, said arms being permanently movable traced, and consequently displaced by two call springs. (Machine-translation by Google Translate, not legally binding)
ES340309A1967-05-091967-05-09Improvements in cavadoras machines. (Machine-translation by Google Translate, not legally binding)
ExpiredES340309A2
(en)