# Relationship history for MSHA mine 1512982

Current hierarchy: **Duffield William → Crystal Energy Inc → No 1**

- 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:** Guy N S Iii → No 1; 1977-10-01 to 1984-10-16; source msha-controller-operator-history
- **operator_operates_mine:** Sam Bass Coal Company Inc → No 1; 1981-07-01 to 1982-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Guy N S Iii → Sam Bass Coal Company Inc; 1981-07-01 to 1982-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Middleton Obie Et Al → No 1; 1982-10-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lesterfield Coal Company → No 1; 1982-10-19 to 1983-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Brassfield Fred & Bruce Lester → No 1; 1982-10-19 to 1983-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Brassfield Fred & Bruce Lester → Lesterfield Coal Company; 1982-10-19 to 1983-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Scott Keith Energy Company → No 1; 1983-11-02 to 1984-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Adams Luther → No 1; 1983-11-02 to 1985-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Adams Luther → Scott Keith Energy Company; 1983-11-02 to 1984-07-02; source msha-controller-operator-history
- **operator_operates_mine:** W J D Coal Company → No 1; 1984-07-03 to 1984-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Middleton Obie Et Al → W J D Coal Company; 1984-07-03 to 1984-09-06; source msha-controller-operator-history
- **operator_operates_mine:** B & F Coal Company Inc → No 1; 1984-09-07 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Fox Rick → No 1; 1984-09-07 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Fox Rick → B & F Coal Company Inc; 1984-09-07 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Lemar Reece → No 1; 1985-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shauna-Darease Coal Inc → No 1; 1985-09-17 to 1993-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Lemar Reece → Shauna-Darease Coal Inc; 1985-09-17 to 1993-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Mt Top Inc → No 1; 1993-04-15 to 1995-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Toby & Teddy Et Al → No 1; 1993-04-15 to 1995-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Toby & Teddy Et Al → Mt Top Inc; 1993-04-15 to 1995-01-04; source msha-controller-operator-history
- **operator_operates_mine:** Crystal Energy Inc → No 1; 1995-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duffield William → No 1; 1995-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duffield William → Crystal Energy Inc; 1995-01-05 to current/open; source msha-controller-operator-history