# MACHINERY
> MSHA accident `220050590020` · 02/21/2005 · National King Coal, LLC
## Details
- **Degree of injury:** DAYS RESTRICTED ACTIVITY ONLY
- **Classification:** MACHINERY
- **Accident type:** Over-exertion NEC
- **Occupation:** Roof bolter, Rock bolter,  Pinner, Mobile roof support operator (MRS)
- **Activity:** Roof bolter, NEC
- **Injury source:** ROOF (ROCK) BOLTS
- **Nature of injury:** SPRAIN,STRAIN RUPT DISC
- **Body part:** BACK (MUSCLES/SPINE/S-CORD/TAILBONE)
- **Days lost:** 0
- **Mine experience:** 1.5 years
## Operator
- **Controller:** Alpha Natural Resources, Inc.
- **Operator:** National King Coal, LLC
- **Mine:** [0500266](https://api.ai-analytics.org/mine/0500266)
## Narrative

While roof bolting, the employee turned and reached for a bolt, when he twisted his back.

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*Source: [MSHA Open Government Data](https://arlweb.msha.gov/OpenGovernmentData/) · AI Analytics · CC0 1.0*