# Relationship history for MSHA mine 1511490

Current hierarchy: **Geary Billy → Panther Creek Coal Corp → Min-Dora Energy No 2 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

- **operator_operates_mine:** Min-Dora Energy Inc → Min-Dora Energy No 2 Surface; 1978-08-01 to 1978-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Tavrides James G → Min-Dora Energy No 2 Surface; 1978-08-01 to 1978-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Tavrides James G → Min-Dora Energy Inc; 1978-08-01 to 1978-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Panther Creek Coal Corp → Min-Dora Energy No 2 Surface; 1978-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Geary Billy → Min-Dora Energy No 2 Surface; 1978-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geary Billy → Panther Creek Coal Corp; 1978-09-25 to current/open; source msha-controller-operator-history