# Relationship history for MSHA mine 4604375

Current hierarchy: **Hord Paul E → Big Bear Coal Company Inc → No 1 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

- **controller_controls_mine:** Belco Petroleum Corp → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & B Coal Company → No 1 Mine; 1974-01-01 to 1974-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Belco Petroleum Corp → L & B Coal Company; 1974-01-01 to 1974-03-01; source msha-controller-operator-history
- **operator_operates_mine:** K & V Coal Company → No 1 Mine; 1974-03-02 to 1975-06-01; source msha-controller-operator-history
- **controller_controls_mine:** K & V Coal Company → No 1 Mine; 1974-03-02 to 1990-04-16; source msha-controller-operator-history
- **controller_controls_operator:** K & V Coal Company → K & V Coal Company; 1974-03-02 to 1975-06-01; source msha-controller-operator-history
- **operator_operates_mine:** H & D Mining Company → No 1 Mine; 1975-06-02 to 1975-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Heatherman C & L E Dempsey → No 1 Mine; 1975-06-02 to 1975-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Heatherman C & L E Dempsey → H & D Mining Company; 1975-06-02 to 1975-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Triadelphia Coal Company → No 1 Mine; 1975-08-30 to 1976-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Browning Randall → No 1 Mine; 1975-08-30 to 1976-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Browning Randall → Triadelphia Coal Company; 1975-08-30 to 1976-11-21; source msha-controller-operator-history
- **operator_operates_mine:** Big Bear Coal Company Inc → No 1 Mine; 1976-11-22 to 1977-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Brown Larry M → No 1 Mine; 1976-11-22 to 1977-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Brown Larry M → Big Bear Coal Company Inc; 1976-11-22 to 1977-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Big Bear Coal Company Inc → No 1 Mine; 1977-12-12 to 1979-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Webb Charles E → No 1 Mine; 1977-12-12 to 1979-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Webb Charles E → Big Bear Coal Company Inc; 1977-12-12 to 1979-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Big Bear Coal Company Inc → No 1 Mine; 1979-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hord Paul E → No 1 Mine; 1979-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hord Paul E → Big Bear Coal Company Inc; 1979-09-19 to current/open; source msha-controller-operator-history