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Proportional spacing

The proportional spacing capability of the IBM Model B Executive Electric Typewriter...

The proportional spacing capability of the IBM Model B Executive Electric Typewriter...
The proportional spacing capability of the IBM Model B Executive Electric Typewriter is illustrated by the two sizes of characters shown in this marketing collateral from the mid-1950s. Conventional spacing is at the top; proportional spacing is at the bottom. Notice how the latter provides more "breathing room" for the wider "m" than for the narrower "i."