# Relationship history for MSHA mine 1516511

Current hierarchy: **Robert M  Keen → Minton Hickory Coal Company → Mine #7**

- 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

- **controller_controls_mine:** TECO Energy Inc → Mine #7; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert M  Keen → Mine #7; 1986-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Long Way Mining Company → Mine #7; 1988-11-01 to 1989-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Reed Charles & Lucille → Mine #7; 1988-11-01 to 1989-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Reed Charles & Lucille → Long Way Mining Company; 1988-11-01 to 1989-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Cober Coal Company → Mine #7; 1989-04-28 to 1992-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Sloane Terry-Randal Holbrook Et Al → Mine #7; 1989-04-28 to 1992-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Sloane Terry-Randal Holbrook Et Al → Cober Coal Company; 1989-04-28 to 1992-12-16; source msha-controller-operator-history
- **operator_operates_mine:** Gatliff Coal Company Inc → Mine #7; 1992-12-17 to 1993-03-16; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Gatliff Coal Company Inc; 1992-12-17 to 1993-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Minton Hickory Coal Company → Mine #7; 1993-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert M  Keen → Minton Hickory Coal Company; 1993-03-17 to current/open; source msha-controller-operator-history