status	feature	original_inches	reference_millimeters	note
ILLUSTRATIVE	Width	4.000	101.6	Inches govern this fictional example
ILLUSTRATIVE	Height	2.000	50.8	No tolerance established
ILLUSTRATIVE	H1 center x	0.500	12.7	From left edge in front view
ILLUSTRATIVE	H2 center x	3.500	88.9	From left edge in front view
ILLUSTRATIVE	Both centers y	1.000	25.4	From lower edge in front view
ILLUSTRATIVE	Center spacing	3.000	76.2	Derived check
ILLUSTRATIVE	Hole diameter	0.125	3.175	Not a fastener or clearance recommendation