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D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
D01G99/00—Subject matter not provided for in other groups of this subclass
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Engineering & Computer Science
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Textile Engineering
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FR552884D1921-11-071921-11-07Procédé et dispositifs pour la fabrication de bandes d'ouate très minces et leur enroulement sur des bobines
ExpiredFR552884A
(fr)
Procédé pour la transmission du son par des dispositifs électriques et pour l'enregistrement et la reproduction du son par des dispositifs photo-électriques