학술논문
PRESIDENTIAL INVENTORS.
Document Type
Article
Author
Source
Boys' Life; Dec2019, Vol. 109 Issue 12, p6-6, 1p, 3 Color Photographs, 1 Black and White Photograph
Subject
Language
ISSN
00068608
Abstract
The article discusses U.S. presidential inventions including George Washington's design of a 16-sided barn and a drill plow, Thomas Jefferson's invention of the swivel chair, and Abraham Lincoln's device to prevent boats from getting stranded in shallow water.