Journal of the Japanese Association for Petroleum Technology
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
On the Rotary Chain
Saburo TODO
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1953 Volume 18 Issue 1 Pages 5-9

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Abstract

Recently, Rotary Chain has increased its strength and durability and has considerably contributed to improve the efficiency of drilling work.
This report indicates the process of studies made by Teikoku Oil Co., Ltd.

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