# Relationship history for MSHA mine 1511262

Current hierarchy: **Hall Billy V → Pine Creek Coal Company → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hall Billy V → No 1 Mine; 1978-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nary-A-Dollar Coal Company → No 1 Mine; 1978-05-01 to 1979-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Hall Billy V → Nary-A-Dollar Coal Company; 1978-05-01 to 1979-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Pine Creek Coal Company → No 1 Mine; 1979-10-23 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Spangler Fred R-Seldom W Price & S T Wright → No 1 Mine; 1979-10-23 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Spangler Fred R-Seldom W Price & S T Wright → Pine Creek Coal Company; 1979-10-23 to 1980-11-24; source msha-controller-operator-history
- **operator_operates_mine:** Pine Creek Coal Company → No 1 Mine; 1980-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Billy V → No 1 Mine; 1980-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Billy V → Pine Creek Coal Company; 1980-11-25 to current/open; source msha-controller-operator-history