# Relationship history for MSHA mine 4606761

Current hierarchy: **Farmer David Wylie → H B Coal Inc → Hickory Patch - Surface Mine #10**

- 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:** Sidusco Inc → Hickory Patch - Surface Mine #10; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leckie Smokeless Coal Company → Hickory Patch - Surface Mine #10; 1984-04-01 to 1984-07-02; source msha-controller-operator-history
- **controller_controls_operator:** Sidusco Inc → Leckie Smokeless Coal Company; 1984-04-01 to 1984-07-02; source msha-controller-operator-history
- **operator_operates_mine:** Greenbrier Coal & Coke Inc → Hickory Patch - Surface Mine #10; 1984-07-03 to 1985-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Turner Jacob Craig → Hickory Patch - Surface Mine #10; 1984-07-03 to 1985-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Turner Jacob Craig → Greenbrier Coal & Coke Inc; 1984-07-03 to 1985-11-19; source msha-controller-operator-history
- **operator_operates_mine:** H B Coal Inc → Hickory Patch - Surface Mine #10; 1985-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Farmer David Wylie → Hickory Patch - Surface Mine #10; 1985-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Farmer David Wylie → H B Coal Inc; 1985-11-20 to current/open; source msha-controller-operator-history