# Relationship history for MSHA mine 4603787

Current hierarchy: **Billy R  Daugherty → Darty Leasing Company Inc → Mine No 1 (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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Belco Petroleum Corp → Mine No 1 (1); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & B Coal Company → Mine No 1 (1); 1973-01-01 to 1974-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Belco Petroleum Corp → L & B Coal Company; 1973-01-01 to 1974-03-13; source msha-controller-operator-history
- **controller_controls_mine:** K & V Coal Company → Mine No 1 (1); 1974-03-02 to 1990-04-16; source msha-controller-operator-history
- **operator_operates_mine:** K & V Coal Company → Mine No 1 (1); 1974-03-14 to 1990-04-16; source msha-controller-operator-history
- **controller_controls_operator:** K & V Coal Company → K & V Coal Company; 1974-03-14 to 1990-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Daugherty Jerry → Mine No 1 (1); 1989-04-07 to 1991-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Double J & B Coal Company Inc → Mine No 1 (1); 1990-04-17 to 1991-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Daugherty Jerry → Double J & B Coal Company Inc; 1990-04-17 to 1991-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Darty Leasing Company Inc → Mine No 1 (1); 1991-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Billy R  Daugherty → Mine No 1 (1); 1991-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billy R  Daugherty → Darty Leasing Company Inc; 1991-10-28 to current/open; source msha-controller-operator-history