# Relationship history for MSHA mine 1512012

Current hierarchy: **James W  Potter → Potter Mining Company Inc → No H-9**

- 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:** James W  Potter et al → No H-9; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blair Ernest → No H-9; 1977-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blair Coal Company Inc → No H-9; 1979-09-01 to 1983-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Blair Ernest → Blair Coal Company Inc; 1979-09-01 to 1983-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Potter Mining Company Inc → No H-9; 1983-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W  Potter et al → Potter Mining Company Inc; 1983-07-19 to current/open; source msha-controller-operator-history