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FR480471A1914-02-041914-09-07Perfectionnements dans ou concernant des appareils pour le poinconnage de cartes enregistreuses et similaires
ExpiredFR480471A
(fr)
Perfectionnements aux appareils servant à indiquer la direction ou l'angle des lignes de courant dans des fluides, applicables, en particulier, à la construction des contre-hélices