INCORRECTLY INCLUDED DATUM

a switch intended for a house put into an airplane electrical system cuts out at 30,000 feet due to the wrong metal to withstand cold and there goes the airplane. A part from one class of parts is included wrongly in another class of parts. So there is an incorrectly included datum which is a companion to the omitted datum as an out-point. (HCO PL 23 Jun 70) Incorrectly Included Datum