Flange, pipe and spool fitting for plant and nuclear work — with the graphics that matter on site: the face of the flange and the rotation of the bolt holes, exported to CAD. Fit a spool to design, to best fit, or into the gap left by the spool it replaces.
Flange-face and bolt-rotation graphics in the surveyor's own convention, exported to DXF with the geometry — because in DC the answer is which way it faces, not just where it is.
To the design, to a best fit of the measured points, or to fill the exact space an old spool left behind — the real jobs, not just the textbook one.
Full Leica prism constants and two cross-checked flange catalogues (1,999 sizes) already built and pinned — the numbers behind a fit are traceable.