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a) not all doorknobs are the same height,

b) about a yard is a convenient height for them to be,

c) a lot of doors have the holes for the knobs pre-drilled, so all doors made by the same company are likely to have the holes at the same height,

d) if you're the guy in charge of making the holes, "a yard" is easier to remember than "34 19/64 inches".

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13y ago

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