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|Guarantee||Time Machine Guarantee|
|Additional Information||1972 erschien In 1972 Heuer launched a technical and futuristic new model with a mathematical sounding name "Calculator". With each Calculator a manual with detailed explanations about all possible arithmetics operations was delivered. The Calculator having a sliderule as bezel was a sophisticated system by which difficult arithmetical problems could be solved. The production period was until 1982. The movement is a calibre 12, originally designed in collaboration by Heuer, Breitling, Hamilton and Buren. It was the first automatic chronograph designed.|