Silver ear trumpets, six parts, telescopic, by Hawksworth Eyre and Co., Sheffield, 1845 Telescopic ear trumpet Audiology 1845
Walking stick hearing aid, by Franck Valery Freres, Paris, 1860-1910 Walking stick hearing aid Audiology 1860-1910
Hearing aid, mechanical, two ear trumpets joined by headband, English(?), 1850-1913 Mechanical hearing aid Audiology 1850-1913