Fred's mechanical calculators . Highlights and list .

The Belgian "Master" firm was producing all these models in the pre W.W. II period . In contemporary advertising leaflets they greatly overrated their "electric Master" (upper left in the picture) by presenting it as being capable of doing the same amount of work in about the same time than machines costing ten times as much ! In fact all "Master" products are nothing more than rather crudely made slide-adders with all the inherent limitations of that concept .

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