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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.