Rubber conversation tube, 19th century
Heap's topophone.
Marshall's Collector ear trumpet, 19th century
Elliptical receptor or artificial hand, ca. 1875
Black ear trumpet, 19th century
Super-ear, ca. 1926
Small ear trumpet, 19th century
Aurolese phone floral tube, ca. 1810
Super-Ear, ca. 1929
Aurolese phones, 1830
Dr. William's pattern ear trumpet, 19th century
Telescoping ear trumpet, 19th century
Pressed board ear trumpet, 19th century
Pressed board telescoping ear trumpet, 19th century
Tragus-like ear trumpet, 19th century
Burkhardt-Merian's tragus-like trumpet, 19th century
Elliptical opening trumpet, ca. 1875
Small Ear trumpet
Miniature ear trumpet, 19th century
Audi-Ear, ca. 1925