Blank assembly left (K30-822) for Monroe K-series calculators

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The accompanying illustration represents a Monroe blank assembly designated for installation on the left-hand side of mechanical calculators from the K- or KA-series manufactured during the time period of 1920 to 1928. The device, serving a vital role within the blanking shaft assembly, effectively zeros out the keyboard of these mathematical instruments. For the M-series, specifically this assembly bears part number 30-822, so we shall hereby refer to it as K30-822 for consistency in notation. This designating reference ensures unambiguous identification throughout the relevant documentation and related specifications. A 3D model has been created using SolidWorks software package. For accurate reproduction, the printed STL file must adhere to a unit-to-inch scale of one unit equals precisely one inch.