# Relationship history for MSHA mine 4103700

Current hierarchy: **Dominick  Leonardo; Steve  Cone → Quality Stone of Mineral Wells, LLC → Quality Stone of Mineral Wells**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Stone-Wall Inc → Quality Stone of Mineral Wells; 1991-11-01 to 1993-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Barnett et al → Quality Stone of Mineral Wells; 1991-11-01 to 1993-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Barnett et al → Stone-Wall Inc; 1991-11-01 to 1993-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Metroplex Quarry Inc. → Quality Stone of Mineral Wells; 1993-07-12 to 2018-05-02; source msha-controller-operator-history
- **controller_controls_mine:** Bart A  Barnett et al → Quality Stone of Mineral Wells; 1993-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bart A  Barnett et al → Metroplex Quarry Inc.; 1993-07-12 to 2018-05-02; source msha-controller-operator-history
- **operator_operates_mine:** Quality Stone of Mineral Wells, LLC → Quality Stone of Mineral Wells; 2018-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dominick  Leonardo et al → Quality Stone of Mineral Wells; 2018-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dominick  Leonardo et al → Quality Stone of Mineral Wells, LLC; 2018-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Cone et al → Quality Stone of Mineral Wells, LLC; 2018-05-03 to current/open; source msha-controller-operator-history