This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain. Please note that national laboratories operate under varying licences and some are not free. Check the site policies of any national lab before crediting it with this tag. العربية ∙ English ∙ français ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ русский ∙ українська ∙ Tiếng Việt ∙ 简体中文 ∙ 繁體中文 ∙ +/−

Übertragen aus en.wikipedia nach Commons durch T.vanschaik mithilfe des CommonsHelper.

• 2010-06-16 12:30 Wizard191 528×454× (32011 bytes) Cropped.
• 2009-06-15 04:41 Materialscientist 640×512× (36448 bytes) brighter
• 2009-06-15 04:40 Materialscientist 640×512× (30432 bytes) {{Information |Description = Si₃N₄ bearings and parts |Source = http://www.ms.ornl.gov/programs/energyeff/cfcc/iof/chap21-2sin.pdf |Date = |Author = ornl.gov |Permission = |other_versions = }