Proprietà:Application date

Data di richiesta del brevetto.

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Patent-FR-737250.pdf +

maggio 18, 1932 +

Patent-FR-737930.pdf +

settembre 24, 1931 +

Patent-FR-739163.pdf +

giugno 27, 1932 +

Patent-FR-750406.pdf +

maggio 6, 1932 +

Patent-FR-750689.pdf +

maggio 11, 1932 +