# Relationship history for MSHA mine 4603092

Current hierarchy: **Donn A  Chickering → New Beckley Mining Corp → Beckley 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:** Beckley Coal Mining Company → Beckley Mine; 1950-01-01 to 1988-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Beckley Coal Mining Company → Beckley Mine; 1950-01-01 to 1988-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Beckley Coal Mining Company → Beckley Coal Mining Company; 1950-01-01 to 1988-09-30; source msha-controller-operator-history
- **operator_operates_mine:** New Beckley Mining Corp → Beckley Mine; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donn A  Chickering → Beckley Mine; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donn A  Chickering → New Beckley Mining Corp; 1988-10-01 to current/open; source msha-controller-operator-history