Improvements in or relating to induction apparatus, more particularly for electro-therapeutics
Publisher: [Great Seal Patent Office?]
Published: 1922
Place of publication: [London?]
Language: eng
Subjects: Electric Stimulation Therapy; Instrumentation
Notes: Title from head of text.

"Paul Bischofberger, of Centralstrasse 28, Lucerne, Switzerland".

Patent number at head of title: 172,919.

"Application date (in United Kingdom): Jan. 20, 1921. no. 2719/21. Complete accepted, Apr. 20, 1922."