# Relationship history for MSHA mine 4104076

Current hierarchy: **Nicky R Thomas Sr. → Nick Thomas, Inc. → Lefors  Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Red River Sand & Gravel → Lefors  Mine; 1999-05-01 to 2008-02-27; source msha-controller-operator-history
- **controller_controls_mine:** James R  Howell Jr et al → Lefors  Mine; 1999-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Howell Jr et al → Red River Sand & Gravel; 1999-05-01 to 2008-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Emmons et al → Red River Sand & Gravel; 1999-05-01 to 2008-02-27; source msha-controller-operator-history
- **operator_operates_mine:** WTL LLC → Lefors  Mine; 2008-02-28 to 2016-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Rusty D  Stevens → Lefors  Mine; 2008-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rusty D  Stevens → WTL LLC; 2008-02-28 to 2016-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Nick Thomas, Inc. → Lefors  Mine; 2016-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nicky R Thomas Sr. → Lefors  Mine; 2016-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicky R Thomas Sr. → Nick Thomas, Inc.; 2016-05-21 to current/open; source msha-controller-operator-history