Application for Czechoslovak patent was filed on 8 November 1990, the patent was approved on 26 October 1992, and ut was patented in USA on March 16,1993, with patent number US5,193,809.
Application for Czechoslovak patent was filed on 8 November 1990. Ut was patented in USA on March 16,1993, with patent number US5. Patent number US5 was 193,809.