Case number 49

Hammered string (Piano string) Hammered string (Piano string) 2 Slide rules Slide rule
Special slide rule Slide rule Japanese calculating machine Russian abacus
Kings Patent calculator Calculating clock of Wichmann Brunsviga sprocket wheel Soroban from Tokyo,  Japan
Calculating machine Curta II Calculating machine Brunsviga 13 Adding device Arithma Calculating machine Curta I
Stschoty from russia Calculating machine Adix Calculating machine Trick Calculating machine Mercedes
Aristo Slide rule model Studio Calculating machine Archimedes Calculating machine Brunsviga 20 Calculating machine Madas Model 12 E
Folding rule Suanpan (chinese abacus) Model of mechanical counters in number systems with the base 2, 4 and 10

The corresponding bottom case is: Case number U 49

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