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Shaft sinking

 Subject
Subject Source: Library of Congress Subject Headings

Found in 1 Collection or Record:

Shaft Sinking Apparatus Patents

 Collection — Sc_box MS 2, Folder: 20
Identifier: MS-612
Abstract

Patents, 1943-1944, issued to John Murray Riddell for improvements to mine shaft sinking apparatus. Includes patent issued by the United States in 1943 as well as a patent issued by the Union of South Africa, a dominion of Great Britain.

Dates: 1943-1944