AD 328: Length of slotted holes and kidney-shaped slots

Does the code state that the maximum slot length as Overall length or Centre to Centre length? I have always created slots as overall length,

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slot game wheel of fortune dimensions are not critical; a convenient method is to cut a 12-in length of standard 1 x 4 pine lumber, which is 3 12 inches wide and 34 inches thick; Two

slot depo 5000 Go, No Go slot gauges are primarily used in production inspection for determining the length and width of a slot are to specification