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Patent-FR-605510.pdf +

settembre 24, 1925 +

Patent-FR-610369.pdf +

dicembre 23, 1925 +

Patent-FR-610947.pdf +

dicembre 21, 1925 +

Patent-FR-614071.pdf +

aprile 3, 1926 +

Patent-FR-61714E.pdf +

maggio 28, 1951 +