# Relationship history for MSHA mine 1509934

Current hierarchy: **Caines Rell → Circle C Coal Co Inc → No 12 Surface**

- 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

- **controller_controls_mine:** Caines Rell → No 12 Surface; 1975-02-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thunder Coal Company Inc → No 12 Surface; 1976-07-06 to 1977-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Blair John M → No 12 Surface; 1976-07-06 to 1977-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Blair John M → Thunder Coal Company Inc; 1976-07-06 to 1977-08-14; source msha-controller-operator-history
- **operator_operates_mine:** D D Owens Enterprises Inc → No 12 Surface; 1977-08-15 to 1978-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Owens Delbert → No 12 Surface; 1977-08-15 to 1978-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Owens Delbert → D D Owens Enterprises Inc; 1977-08-15 to 1978-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Circle C Coal Co Inc → No 12 Surface; 1978-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caines Rell → Circle C Coal Co Inc; 1978-08-09 to current/open; source msha-controller-operator-history