The small pieces are missing. Everything in the photos come with it.

This is a Plan Hold / Plani-Hold 385DM Drawing Machine — a vintage drafting tool used by architects, engineers, illustrators, and technical drafters before CAD software became standard.

The device mounts onto a drafting board and provides:

* A straightedge that slides smoothly across the board

* Accurate parallel lines

* Angle and measurement guidance

* Technical drawing support for blueprints and engineering drawings

paperwork shows:

* Model: 385DM

* Size: 24 x 30

* Made by Plan Hold Corporation, Irvine, California

* Instruction sheet dated around 1981 (“10/81” printed at bottom)

The cream-colored crossbar and sliding ruler assembly in your photos are the actual drafting mechanism. It would have attached to a drafting table or portable drawing board.

Typical Uses

People used these for:

* Architectural drafting

* Mechanical engineering drawings

* Technical illustration

* Blueprint preparation

* Graphic layout work