ORGANIZATION@1 television initially used two systems , on alternate weeks : the 240-line Baird intermediate film system and the 405-line Marconi-EMI system , each making the ORGANIZATION@2 's first regular high-definition television service , broadcasting Monday to Saturday from NUMBER@1 to NUMBER@2 and NUMBER@3 to NUMBER@4 .

A 240-line intermediate film system and the Marconi-EMI 's 405-line all-electronic television service .
