# Relationship history for MSHA mine 1511211

Current hierarchy: **Minerva Ruth  Mead → MRI Mining Inc → No. 6**

- 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:** Tram Coal Company Inc → No. 6; 1978-04-01 to 1993-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Emmett  Lawson → No. 6; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Emmett  Lawson → Tram Coal Company Inc; 1978-04-01 to 1993-09-06; source msha-controller-operator-history
- **operator_operates_mine:** High Ridge Coal Company Inc → No. 6; 1993-09-07 to 2002-12-26; source msha-controller-operator-history
- **controller_controls_mine:** Earl  Lawson et al → No. 6; 1993-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl  Lawson et al → High Ridge Coal Company Inc; 1993-09-07 to 2002-12-26; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Lawson et al → High Ridge Coal Company Inc; 1993-09-07 to 2002-12-26; source msha-controller-operator-history
- **controller_controls_mine:** Jill  Slone → No. 6; 1998-08-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gun Hill Coal Co., Inc. → No. 6; 2002-12-27 to 2007-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Jill  Slone → Gun Hill Coal Co., Inc.; 2002-12-27 to 2007-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Minerva Ruth  Mead → No. 6; 2003-02-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MRI Mining Inc → No. 6; 2007-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Minerva Ruth  Mead → MRI Mining Inc; 2007-02-08 to current/open; source msha-controller-operator-history