![In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation](https://invention.si.edu/sites/default/files/inventors-hammer-william-in-army-uniform-ww1-si-neg-85-408-750-inline-edit.jpg)
In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
![In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation](https://invention.si.edu/sites/default/files/inventors-hammer-william-x-ray-demo-for-daughter-mabel-1902-si-neg-85-8778-750-inline-edit.jpg)
In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
![In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation](https://invention.si.edu/sites/default/files/inventors-hammer-william-ac0069-0000017-sepia-teaser-edit.jpg)
In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
![William Hammer - 19th Century Paintings and Watercolours 2017/12/05 - Realized price: EUR 6,827 - Dorotheum William Hammer - 19th Century Paintings and Watercolours 2017/12/05 - Realized price: EUR 6,827 - Dorotheum](https://www.dorotheum.com/fileadmin/lot-images/38N171205/normal/william-hammer-a-202945.jpg)
William Hammer - 19th Century Paintings and Watercolours 2017/12/05 - Realized price: EUR 6,827 - Dorotheum
![In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation](https://invention.si.edu/sites/default/files/inventors-hammer-william-with-wright-flyer-nasm-9A01542-750-inline-edit.jpg)
In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
![Lot - William Hammer, (1821-1889 Danish), Basket of fruit still life, 1872, Oil on canvas laid to canvas, 24" H x 32.25" W Lot - William Hammer, (1821-1889 Danish), Basket of fruit still life, 1872, Oil on canvas laid to canvas, 24" H x 32.25" W](https://image.invaluable.com/housePhotos/johnmoran/40/645840/H0045-L174297760.jpg)