# Relationship history for MSHA mine 4404548

Current hierarchy: **Lester Troy → Dry Knob Coal Company Inc → 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

- **controller_controls_mine:** Browning Patricia → No 2; 1976-10-10 to 1978-05-07; source msha-controller-operator-history
- **operator_operates_mine:** B & H Coal Company Inc → No 2; 1976-11-11 to 1977-08-11; source msha-controller-operator-history
- **controller_controls_operator:** Browning Patricia → B & H Coal Company Inc; 1976-11-11 to 1977-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Winfield Mining Company → No 2; 1977-08-12 to 1978-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Molinary John → No 2; 1977-08-12 to 1978-12-03; source msha-controller-operator-history
- **controller_controls_operator:** Molinary John → Winfield Mining Company; 1977-08-12 to 1978-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Lester Troy → No 2; 1977-10-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Double H & R Coal Company Inc → No 2; 1978-12-04 to 1979-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Hawkins Don E Et Al → No 2; 1978-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hawkins Don E Et Al → Double H & R Coal Company Inc; 1978-12-04 to 1979-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Dry Knob Coal Company Inc → No 2; 1979-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester Troy → Dry Knob Coal Company Inc; 1979-11-14 to current/open; source msha-controller-operator-history