# Relationship history for MSHA mine 4404494

Current hierarchy: **Harman Robert & Gilbert → Harman Brothers 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Roulett J B → No 1 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Page Fork Coal Company Inc → No 1 Mine; 1976-07-08 to 1979-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Roulett J B → Page Fork Coal Company Inc; 1976-07-08 to 1979-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Harman Brothers Coal Company Inc → No 1 Mine; 1979-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harman Robert & Gilbert → No 1 Mine; 1979-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harman Robert & Gilbert → Harman Brothers Coal Company Inc; 1979-06-21 to current/open; source msha-controller-operator-history