1967

First dedicated imaging device for the breast comes on the market (Charles Gros’s Senograph). Siemens, Philips, and Picker begin selling special mammography units by early 1970s (Kevles, 253). Papers coauthored by Jacques Miller and Graham Mitchell establish that lymphocytes that passed through the thymus were the most important immune cells accounting for acquired immunity: T- (thymus) cells, “educated” in the thymus, would “roam the body via the bloodstream, return to the lymph nodes and the spleen (as Gowans had observed), and thus perform immune surveillance (Hall, 171).