IBM's Type 011 Electric Punch. Introduced in 1923, when IBM cards had 45
columns and round holes. This was the first punch with electric power;
holes are punched by electromagnets rather than muscle power, at a great
reduction in operator fatigue. Strictly numeric, the machine also includes
a tabbing feature similar to typewriter tab stops.
The keyboard of the Type 011 has 12 keys, one for each of
the 12 rows of the card, plus a Release and a Space key. Each key press
punches a hole in the corresponding row and advances the card one column.
The X (11) key tabs to the next tab stop (if any).
The second image at left shows an 80-column card positioned for punching.
Thus one must suppose that after 1928, the Type 011 was re-engineered for
80-column cards with rectangular holes.
IBM Accounting Machines, Customeer Engineer Manual of Instruction:
Electric Punch Type 011, International Business Machines Corporation,
New York, New York (undated).