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Patent US1540826 A for drilling hexagon holes was published on June 9, 1925. The author is Harry J. Watts (Pensylvania).
Derivative and partial derivative
First order ODE
Definite integral and mean value
Geometrical applications of definite integral
Local maxima and minima in two variables
Domain of functions (one variable)
Domain of functions (two variables)
Least squares method
Second order LDE
Fixed point iterations
Multiplication on an old calculator, probably unique on the world (at least the type not mentioned in any book)
The rest of the
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