Showing posts with label inventions. Show all posts
Showing posts with label inventions. Show all posts

7/23/19

Noise-canceling headphones, 1902.


6/26/19

4/5/19

New Idea Parade 15


10/23/18

9/5/18

New idea Parade #13


2/23/18

1/10/18

11/9/17

New Idea Parade #9