A voucher is a bond of the redeemable transaction type which is worth a certain monetary value and which may be spent only for specific reasons or on specific goods.
In 1985 a robot, the Unimation Puma 200, was used to place a needle for a brain biopsy using CT guidance. In 1992, the PROBOT, developed at Imperial College London, was used to perform prostatic surgery by Dr. Senthil Nathan at Guy's and St Thomas' Hospital, London. This was the first pure robotic surgery in the world.
YouTube. In 1893, exactly 119 years ago Monday, Chicago surgeon Daniel Hale Williams performed the first successful open-heart surgery, in what would become both a significant medical advancement, and a huge step in the fight for equality, since Williams was one of the nation's few black cardiologists at the time.