|"The great depression in 1923 saw a
company under great stress for even a box of matches sold
for 1 billion marks. In spite of difficulties the Walther
Company managed to start again. By 1924 the Company
looking towards new products to assist its recovery
commenced making calculating machines based on the pin
drum mechanism. A method by which depending on a
selection lever a number of teeth remained protruding to
actuate a pinion located in a movable carriage."
Ray Mackay - The Walther Company - Historic Recollections.
Source: Ray Mackay