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a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier
a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier
a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier
a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier
a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier