was one of the pioneers in the calculating machine industry.
Despite nearly sixty years of calculating machine production,
this is the first fully-automatic four-function calculator
It uses a full 11-column keyboard for entry of all values.
machine is unique in the way it uses its registers. The revolutions
register can be added to directly, so it can be used as a
second resuts register for addition problems. It also doubles
as the control register for multiplication problems. Back
explicitly provided for, but dividing by result by 1 places
it in the
revolutions register, making it available as the multiplier
for the next
operation. There is also a non-visible memory register, which
is accessed by the sliding lever at the left of the keyboard.
lever towards the front of the machine stores the value in
the keyboard, and pushing the lever towards the back of the
will recall the value into the keyboard.
particular machine has a non-standard keyboard column coloring,
the words “Autobahn – BA
Nbg.” engraved on the back prior to the paint being
applied, suggesting this may have been a special order.