Reeducation Auditive by Harrys, French, early 20th century, outfit in fitted velvet and silk lined case, with celluloid and nickel plated ear trumpet, pair of celluloid auricles with headband, battery operated therapeutic noise emitting device; a similar cased device, Belgian, L'Aurivibril du Docteur Mourue, with dome ear trumpet in fitted case; an Ardente conversation tube, English, early 20th century, sprung steel tube with aluminium bell and celluloid earpiece, 117cm, and a good conversation tube by Hawksley, with Bakelite bell and earpiece, 135cm (4)