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www.google.com.auhttp://www.google.com.au/patents/US1919636?utm_source=gb-gplus-sharePatent US1919636 - SYSTEM OF MINING OH

Patent US1919636 - SYSTEM OF MINING OH

SYSTEM OF MINING OH

SAMUEL N. KARRICK et al

Abstract

Overview
Abstract
Drawings
Description
Claims

Patent number: 1919636
Filing date: 5 Mar 1930
Issue date: 25 Jul 1933

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