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  Viewed blood Cells under Microscope
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  Discovered blood types: A, B, O.
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  Discovered 4th blood type: AB
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  Established first blood donor service.
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  Method to store blood for transfusions.
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  First blood bank.
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  Discovered Rh protein.
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  First case reported in the Congo.
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  Identified virus casing AIDS
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  Test screen for diseases such as HIV.
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  Scientist start doing blood-screenings for diseases.
