# Relationship history for MSHA mine 1512725

Current hierarchy: **Coleman Denzil → Cynthia Coal Company Inc → Cynthia Coal Company Inc No 8**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Duncan Ralph E Et Al → Cynthia Coal Company Inc No 8; 1975-05-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cynthia Coal Company Inc → Cynthia Coal Company Inc No 8; 1981-03-01 to 1982-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Duncan Ralph E Et Al → Cynthia Coal Company Inc; 1981-03-01 to 1982-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Cynthia Coal Company Inc → Cynthia Coal Company Inc No 8; 1982-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Denzil → Cynthia Coal Company Inc No 8; 1982-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Denzil → Cynthia Coal Company Inc; 1982-03-09 to current/open; source msha-controller-operator-history