Q.

In which year was the Ferrosand process patented?

A. 1960
B. 1965
C. 1970
D. 1975
Answer» B. 1965
Explanation: the manganese greensand process has been used in the united states since the 1950s. during the early years of its use, hungerford & terry, inc. of clayton, new jersey, worked to improve the process and eventually developed the ferrosand® cr process, patented in 1965.
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