Industrial jewel
Esquema
Jerarquía
<materials by composition> > inorganic material > rock > <rock by form> > stone (worked rock) > <stone by function>
Descripción
Hard stone, usually ruby and sapphire, used chiefly for bearings and impulse pins in instruments and for recording needles.
URI original del concepto
Otros términos
- industriële diamant [nl]
- gema industrial [es]
- jewel, industrial [en]