Aid in drawing parallels?, 7 letters
Drafting aid, 7 letters
Draftsman's tool, 7 letters
Draftsman's tool (and a hint to this puzzle's theme), 7 letters
Drawing board item, 7 letters
Drawing-board staple, 7 letters
On the Q.T., a user observes rule, 7 letters
Rest of a triangle, 7 letters
Architects' aids, 8 letters
Drafting aids, 8 letters
Drafting tools, 8 letters
Draftsmen's tools, 8 letters
Drawing-board tools, 8 letters
Boarding-house offering, 12 letters