Prof. Geo. Chase's electric invisible ear drums
Subtitle: thousands now in use : an improvement on all other so-called ear drums
Publisher: G. Chase
Published: 1891
Place of publication: Orillia, Ont
Language: eng
Number of pages: 30
Other titles: Trade catalogues (NLC), Medical/Technical, part 2; Catalogues commerciaux (BNC), médical/technique, partie 2
Notes: Title from cover.