1. Welder
Copyright: kadmy / 123RF Stock Photo
2. Oil Change
Copyright: vladacanon9 / 123RF Stock Photo
3. Snow Plow
Copyright: inyrdreams / 123RF Stock Photo
4. Steel
Copyright: deyangeorgiev / 123RF Stock Photo
5. Fire/Firewood
Copyright: pixelsaway / 123RF Stock Photo
6. Compressed Gas
(c) Can Stock Photo
7. Nuts & Bolts
© Jackrit Wutthiprechachan | Dreamstime.com – Grunge Screw Nuts Bolts and Rings on Diamond Steel Plate