# Relationship history for MSHA mine 1508045

Current hierarchy: **Duncan Ralph E → Clear Creek Coal Company Inc → Clear Creek 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:** Clear Creek Coal Company → Clear Creek Mine; 1974-10-03 to 1975-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Quisenberry Charles → Clear Creek Mine; 1974-10-03 to 1975-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Quisenberry Charles → Clear Creek Coal Company; 1974-10-03 to 1975-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Clear Creek Coal Company Inc → Clear Creek Mine; 1975-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duncan Ralph E Et Al → Clear Creek Mine; 1975-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duncan Ralph E Et Al → Clear Creek Coal Company Inc; 1975-03-20 to current/open; source msha-controller-operator-history