Breast pump patent for Joel S Gilbert, filed Mar 13, 1906. Text excerpt: "[M]y improvement comprises a shield adapted to be applied to the nipple of the breast, a single tube affixed to the neck of the cup, a tubular fork ... a tube on each branch end of the fork and a collapsible suction bulb or bulbs, made of resilient material, connected with the branch tubes, and by the re-expansion of which bulbs, after having been collapsed, a suction is exerted through the ducts of my device.”
(Source: US Patent and Trademark Office)