Fantastic Brunsviga Calculator Model 13RK. 1950's.

Fantastic Brunsviga Calculator model 13RK, serial number 13-74976. Manufactured in the 50's. In museum condition! Beautiful and pristine calculating machine with original light green casing with different numbering registers. It is also a very beautiful machine aesthetically, as the different levers and registers in maroon color, make a decorative color contrast with the light green of the housing getting this piece, besides a very functional device, is also very attractive. Its mechanism is based on a toothed wheel that can show more or less teeth depending on the position of a lever. Numbers in white enamel. The enamel is in perfect condition, making the piece look practically new. The chrome plating is shiny, as if it came from the factory. It has a black plate on the back with the maker's name. On the front it has the logo with the name of the brand: Brunsviga. In the lower part we can see two small plates with the model: 13RK and the serial number: 13-74976. It is revised and in perfect working condition as just purchased. Attached is a user's manual (copy of the original manual in German) with explanatory drawings that will undoubtedly make it easier to use. This type of machines are objects for science lovers. They have their origin back in the 17th century, when the first adding machines were built, characterized by using a gear-based operation, which arose to alleviate the work activity of those people engaged in accounting work. This type of machines were already much admired at the time, based on a system devised by Willigodt Odhner, the variant of the one developed by Leibniz in the 18th century. The house Brunsviga manufactured from 1892 calculators under Odhner's licenses. Its engineer Trinks began to greatly improve the original design from this machine, highlighting the fineness of its operation. Successive models would be developed, expanding the technical features and adapting to the functional needs of society as time and technology progressed. In the post-war period, industrial design was applied to these devices for the first time, developing technologically advanced models at high prices. It is amazing to see the internal complexity of one of these mechanisms, and the smoothness and precision with which they work. Incredible collector's item for a true nostalgic of mathematics in the age of technology.