# Relationship history for MSHA mine 4403729

Current hierarchy: **Harman Robert & Gilbert → Harman Brothers Coal Company 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:** Page Fork Coal Company Inc → Mine No 2; 1974-01-01 to 1981-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Roulett J B → Mine No 2; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roulett J B → Page Fork Coal Company Inc; 1974-01-01 to 1981-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Harman Robert & Gilbert → Mine No 2; 1979-06-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harman Brothers Coal Company Inc → Mine No 2; 1981-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harman Robert & Gilbert → Harman Brothers Coal Company Inc; 1981-03-17 to current/open; source msha-controller-operator-history