(页面存档备份,存于互联网档案馆) The Calotype Patent Lawsuit of Talbot v. Laroche, 1854, by R. D. Wood Talbot and Photogenic Drawing (页面存档备份,存于互联网档案馆) Science & Society
(页面存档备份,存于互联网档案馆) United States Patent 6668745, issued 2003. Francis ER Fishing lure for simulated feeding (页面存档备份,存于互联网档案馆) Patent number: 4858370, issued 22
7mm和2mm)制造了彩色可重新装填的笔芯。Koh-i-Noor则在2.0、3.15和5.6mm上做出了彩色可充填的自动铅笔。 技术绘图工具(英语:Technical drawing tools) mechanical pencil – definition. American English definition of mechanical