Factory_Glass
Factory glass is a term used by collectors of art glass to distinguish relevant items, mostly of decorative rather than utilitarian glass, from the more individual or unique studio glass and by studio glass artists to distinguish their work from the more standardised items which are generally made in larger glassworks.[1] It can be an equivalent for the 20th century of the term art glass, which is largely applied to 19th-century or early 20th-century pieces.
It is difficult to specify how large a glassworks would be before it is considered a factory but size is not the key indicator. The crucial distinction would be where there is a significant degree of specialisation or "division of labour" as opposed to the more hands-on working methods used by a single glass artist, with perhaps an assistant, in a studio.