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Werkwijze voor het stabiliseren van ferromagnetische chroomdioxydedeeltjes, de aldus vervaardigde deeltjes, en magnetisch opneemorgaan dat deze deeltjes bevat.
Schakelinrichting voor het besturen van de rotatiesnelheid van een, met de magnetiseerbare band samenwerkende, roteerbare magneetkopdrager van een magnetische bandregistreer- en weergeefinrichting.