# Relationship history for MSHA mine 4604264

Current hierarchy: **Radabaugh Austin Blaine → Proven Coal Reserves Inc → Continental No2**

- 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

- **operator_operates_mine:** Continental Coal Corp → Continental No2; 1974-06-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Hamner Keith → Continental No2; 1974-06-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Hamner Keith → Continental Coal Corp; 1974-06-01 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Proven Coal Reserves Inc → Continental No2; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Radabaugh Austin Blaine Et Al → Continental No2; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Radabaugh Austin Blaine Et Al → Proven Coal Reserves Inc; 1985-07-01 to current/open; source msha-controller-operator-history