[quote=kuduae
DRPatent # 123902 (1901) covered Krieghoff's "scientific" procedure to calculate the "ideal" gunstock dimensions from body measurements of the customer, calculating from height, arm length, cheekbone, shoulder, neck, chest, shoulder to eye dimensions. A hogback stock is not mentioned here, though it may be a result of such calculations.
[/quote]

This is the Krieghoff stock measuring system, taken from a 1970's Krieghoff catalog.