The concept of the slurry machine was being considered and thought about as far back as the 1960’s. It is unclear who thought of it first. In the UK, John Bartlett, a senior partner of Mott Hay and Anderson (now called Mott MacDonald), filed a patent for the Bentonite Shield in 1965 (published in 1967) whilst at the same time in Japan early attempts to make slurry machines were being considered by Okumura, Mitsubishi and Kawasaki and maybe other Japanese companies.
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