/https://covers.openlibrary.org/b/id/11806903-L.jpg)
Specification of Arnold Hirst Watkins
por
Patent for "an improved respirator to be used in confined positions rendered unhealthy from the presence of noxious gases or effluvia"
- ● 82% match for you
the long version
Patent for "an improved respirator to be used in confined positions rendered unhealthy from the presence of noxious gases or effluvia"
M
Margaret's verdict
"Patent for "an improved respirator to be used in confined positions rendered unhealthy from the presence of noxious gases or effluvia""
highlights
what readers held onto
No highlights yet. Be the first.
discussion
what readers said
No reviews yet. Finish it; tell us what you found.