Attach a document saved before drawings were kept per instrument (one set
for the whole chart) to the instrument it was saved with, so no one loses
the drawings they already have. It is written only when the store holds
nothing for that instrument yet and the document has something in it; an
instrument that already has its own keeps it. True when it was written.
Attach a document saved before drawings were kept per instrument (one set for the whole chart) to the instrument it was saved with, so no one loses the drawings they already have. It is written only when the store holds nothing for that instrument yet and the document has something in it; an instrument that already has its own keeps it. True when it was written.