# Relationship history for MSHA mine 1510924

Current hierarchy: **Conley John → Conley Coal Company Inc → Conley No 2 Surface Mine**

- 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:** Ford Energy Corp → Conley No 2 Surface Mine; 1977-08-01 to 1979-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Ramsey Rick → Conley No 2 Surface Mine; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ramsey Rick → Ford Energy Corp; 1977-08-01 to 1979-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Tygart Creek Coal Company Inc → Conley No 2 Surface Mine; 1979-01-17 to 1979-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Moreland Frank T → Conley No 2 Surface Mine; 1979-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moreland Frank T → Tygart Creek Coal Company Inc; 1979-01-17 to 1979-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Conley Coal Company Inc → Conley No 2 Surface Mine; 1979-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Conley John → Conley No 2 Surface Mine; 1979-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Conley John → Conley Coal Company Inc; 1979-04-02 to current/open; source msha-controller-operator-history