Address and telephone number file for attachment to key-ring - is hollow block made of rigid transparent material and contains inscribed lined cards

摘要

The hollow block (1) is made of permanent rigid transparent material, contains lined cards (2) inscribed with telephone numbers together with addresses, and is designed for attachment to a key ring. It has a ring (5) or a chain for handling purposes, the cards being inserted by sliding through an opening (4) in the head. The block may also be provided with spaces (6,7) for advertisements.