Case number 52

Movable metal framework to the theory of the null system xy' - x'y + K (z-z') = 0 Real part surface with edge of regression Model of the gyro compass with globe built-in elevator mechanism
Calculating machine Burkhardt-Arithometer Calculation machine Brunsviga type 13 Z Calculating machine Brunsviage D 810
Plane (almost mathematical) pendulum XxX Seidel & Naumann calculation machine Calculation machine Haman, Typ Elma

The corresponding bottom case is: Case number U 52

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