# Relationship history for MSHA mine 1513968

Current hierarchy: **Mc Coy Linda → K & S Coal Company Inc → No E-2**

- 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:** Williams Randy → No E-2; 1979-02-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Williams Brothers Coal Company Inc → No E-2; 1983-03-01 to 1984-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Williams Randy → Williams Brothers Coal Company Inc; 1983-03-01 to 1984-06-17; source msha-controller-operator-history
- **operator_operates_mine:** D & H Coal Company → No E-2; 1984-06-18 to 1985-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Harvel Harvey Et Al → No E-2; 1984-06-18 to 1985-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Harvel Harvey Et Al → D & H Coal Company; 1984-06-18 to 1985-04-17; source msha-controller-operator-history
- **operator_operates_mine:** K & S Coal Company Inc → No E-2; 1985-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Coy Linda → No E-2; 1985-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Coy Linda → K & S Coal Company Inc; 1985-04-18 to current/open; source msha-controller-operator-history