|
|||
|
< |
Leadholder or Related Patent Thumbnail Index |
direct link http://www.leadholder.com/pat-us00215521-1879-eagle.html |
|
|
|
|||
|
date of application date granted inventor assignee patent holder country |
1879 February 7 1879 May 20 Joseph Hoffman Joseph Reckendorfer United States |
|||
| patent employed on |
 Eagle Automatic Pencil |
|||
This is, it seems, the first pushbutton spring clutch pencil. This is the first time it was patented in the US certainly, but I find it hard to believe it wasn't used earlier when as early as 1822 mechanical pencils were being developed that had actual propelling mechanisms.   
|
|
| |||
| © 2001 to 2008 Dennis B. Smith |
^ top |
||
| |||
