Shaft Sinking Apparatus Patents
Collection Scope and Content Summary
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
Access
Available for use in the Michigan Technological University Archives and Copper Country Historical Collections.
Biography
Extent
0.01 Cubic Feet (1 folder)
Language of Materials
English
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.
Processing History
Elizabeth Russell,2/5/2010
- Title
- Shaft Sinking Apparatus Patents
- Author
- Finding aid prepared by Elizabeth Russell
- Date
- 2/5/2010
- Language of description
- Undetermined
- Script of description
- Code for undetermined script
- Language of description note
- Description is in English
Repository Details
Part of the Michigan Technological University Archives and Copper Country Historical Collections Repository