Suggest an edit12:05For Schools and Colleges: Engineering: Craft and Science: Unit 3: Electricity at Work: 1: Three-phase distributionBBC One Mon 1st Dec 1969, 12:05 on BBC One LondonIntroduced by D. R.C. Holmes.[Repeat](Colour)ContributorsPresenter:D. R.C. HolmesProducer:Nat Taylor Source: Radio Times Suggest an edit