# Relationship history for MSHA mine 4404708

Current hierarchy: **Lester Troy → Dry Knob 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:** Wolford Lonnie W → No 1 Mine; 1977-03-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Faith Coal Company Inc → No 1 Mine; 1977-05-01 to 1977-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Wolford Lonnie W → Faith Coal Company Inc; 1977-05-01 to 1977-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Dry Knob Coal Company Inc → No 1 Mine; 1977-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lester Troy → No 1 Mine; 1977-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester Troy → Dry Knob Coal Company Inc; 1977-10-10 to current/open; source msha-controller-operator-history