My first try at a Riley Riddle, enjoy.
My prefix fired bullets for King and Country,
My infix won't do what you say,
My suffix shows the relation of different quantities,
As a whole I will help you if you need to write fast.
Who/what am I?
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Stenograph
This is a
fast typewriter for e.g. court reporters.
Explanation:
Prefix: Sten, a type of gun
Infix: No
Suffix: Graph, referring to the graph of a function (or maybe a line chart, charts are also sometimes called graphs)