Artifact Detective: Rite-Line Paper Holder

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What we know:

This item belonged to Rita Trombly Manning when she worked for the FBI from the 1940s to 1970s.

We know Ms. Trombly worked as a stenographer, someone who takes notes in shorthand, in various departments, including the Records and Communications Division and the Crime Records Division.

A note included with the object says, “Device allows you to insert an already typed paper and add another line to it.”

Office supply: Rite-Line Copy Holder. 2011.12.6 Collection of the National Law Enforcement Museum, Washington, D.C.
What we want to know:

What is the primary purpose of this device?

How does this object work with a piece of paper?

What year was this item made and in what years was it used?

Was this an everyday office supply?

Was this a common office supply for law enforcement offices?

If you have any information about this object or own an object similar to this, leave us a comment!