The stippling shown on the ballpoint pen represents a surface texture.
The broken lines showing interior structure in
The stippling shown on the ballpoint pen represents a surface texture.
The broken lines showing interior structure in
| Number | Date | Country | Kind |
|---|---|---|---|
| 2007-014140 | May 2007 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 1351552 | Bricken | Aug 1920 | A |
| 2924219 | Wershaw | Feb 1960 | A |
| D374893 | Yazawa | Oct 1996 | S |
| D401967 | Tam | Dec 1998 | S |
| D404070 | Hasegawa | Jan 1999 | S |
| D421052 | Yazawa | Feb 2000 | S |
| 6273626 | Yazawa | Aug 2001 | B1 |
| D500337 | Tsuchida | Dec 2004 | S |
| D523476 | Nakazawa | Jun 2006 | S |
| D553680 | Kusaba | Oct 2007 | S |
| D562894 | Nishida | Feb 2008 | S |
| D575822 | Rolion et al. | Aug 2008 | S |