Double oversize, unidentified and unnumbered

This series contains technical drawings created by Link's aviation companies. Because drawings were often created and amended several times, dates on the drawings are often unclear. Because of this, dates are not noted on this series.

Technical drawings include entire complete machines (usually in the larger sizes), as well as machine parts (usually on smaller sizes). It appears that numbers were often assigned in a series to related drawings, for example for a machine and each of its parts. Frequently the same drawing could be assigned multiple numbers that correlate to different sizes of the same object. For example a drawing of a screw might have multiple numbers for each seperate measurement of length and width. It is unclear what the lettered C series contains, but the SK series appears to be schematics.