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W. Odhner got patent US209416 A on October 29, 1878. His invention turned to the first mass produced calculator. The application was submitted on July 13, 1878.
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
Free high quality math tests for students to practice curriculum. Easy, friendly, modern. Try it. High recommended. Click the image below.
Detailed view on vintage Mercedes Euklid 38 calculator (by Jaroslav Pochylý).