# Relationship history for MSHA mine 4405670

Current hierarchy: **Stacy Kerry → Frontier Mining 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

- **operator_operates_mine:** Commonwealth Mining Inc → No 1 Mine; 1981-06-01 to 1982-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Hurley Steve → No 1 Mine; 1981-06-01 to 1982-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Hurley Steve → Commonwealth Mining Inc; 1981-06-01 to 1982-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Frontier Mining Company Inc → No 1 Mine; 1982-01-20 to 1983-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Jackson Randle P Et Al → No 1 Mine; 1982-01-20 to 1983-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Randle P Et Al → Frontier Mining Company Inc; 1982-01-20 to 1983-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Frontier Mining Company Inc → No 1 Mine; 1983-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stacy Kerry → No 1 Mine; 1983-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacy Kerry → Frontier Mining Company Inc; 1983-11-04 to current/open; source msha-controller-operator-history