Synchronising Defibrillator, circa 1975

I found this photo while having a clear-out at work. It was taken in 1990, but the machine dates from long before that, and had been 'in use' in the Clinical Pharmacology department (prop. Mrs Pauline Patel) at Barts. The photo was sent to Cambridge Instruments to find out whether they still supported it. Type 00106D018, S/N 7530059.