… (whether or not printed or backed with paper, paperboard, plastics or similar backing materials) of a thickness …
Explanatory notes
… (whether or not printed or backed with paper, paperboard, plastics or similar backing materials), of a thickness … making fancy goods, is often backed with paper, paperboard, plastics or similar backing materials, either for … glue or other binder, or of copper deposited on paper, plastics or other support, and used for printing book …