Hierarchy classification:

1. top of the aat hierarchies
2. Brand Names Facet
3. Brand Names (hierarchy name)
4. brand name objects

Anotations

Scope note:

Copies made on a particular early projection photocopier created in the first decade of the 1900s by the Commercial Camera Company, which became the Photostat Corporation. The "Photostat" name, was originally a trademark of the company, later became genericized, and was often used to refer to similar machines produced by the Rectigraph Company.