# Relationship history for MSHA mine 4603786

Current hierarchy: **Billy R  Daugherty → Darty Leasing, Inc. → Mine No 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

- **operator_operates_mine:** No 10 Coal Mining Corp → Mine No 2; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Belco Petroleum Corp → Mine No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Belco Petroleum Corp → No 10 Coal Mining Corp; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **operator_operates_mine:** No 10 Coal Mine Inc → Mine No 2; 1974-11-01 to 1985-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Hawley Charbon → Mine No 2; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hawley Charbon → No 10 Coal Mine Inc; 1974-11-01 to 1985-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Mine No 2; 1985-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alpine Development Company → Mine No 2; 1985-09-07 to 1995-11-26; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Alpine Development Company; 1985-09-07 to 1995-11-26; source msha-controller-operator-history
- **controller_controls_mine:** Billy R  Daugherty → Mine No 2; 1991-10-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Darty Leasing, Inc. → Mine No 2; 1995-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billy R  Daugherty → Darty Leasing, Inc.; 1995-11-27 to current/open; source msha-controller-operator-history