# MACHINERY
> MSHA accident `220101380018` · 05/12/2010 · Hanson Material Service
## Details
- **Degree of injury:** DAYS RESTRICTED ACTIVITY ONLY
- **Classification:** MACHINERY
- **Accident type:** Over-exertion NEC
- **Occupation:** Laborer, Blacksmith, Bull gang, Parts runner, Roustabout, Pick-up man, Pitman
- **Activity:** Hand tools (powered)
- **Injury source:** DRIL-PRCUSV,HRD ROC,JKHMR
- **Nature of injury:** SPRAIN,STRAIN RUPT DISC
- **Body part:** BACK (MUSCLES/SPINE/S-CORD/TAILBONE)
- **Days lost:** 0
- **Mine experience:** 3.29 years
## Operator
- **Controller:** Heidelberg Materials AG
- **Operator:** Hanson Material Service
- **Mine:** [1100068](https://api.ai-analytics.org/mine/1100068)
## Narrative

A laborer suffered an acute lumbar strain while using a 90lb jackhammer to break concrete. While breaking the concrete a chunk broke free causing him to lose control of the jackhammer. When he attempted to regain control of the jackhammer he strained his back.

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