A ribbon supply apparatus including a support in which a ribbon supply spool and a take-up spool are rotatably mounted. The supply and take-up spools and the support are designed so that these spools can be mounted in the support in only one way, the correct way. The ribbon is supplied on a tubular core...http://www.google.com.au/patents/US5374007?utm_source=gb-gplus-sharePatent US5374007 - Ribbon supply apparatus
