mimeograph; stencil duplicator
Refers to the mimeograph printing process or the machine itself, once common in schools and offices for making copies.
In old schools, tests were often printed using a mimeograph.
Hiragana variant, less common but still seen.
From ガリ (onomatopoeia for scratching) + 版 (printing plate), referring to the sound of the stylus on the stencil.