# Relationship history for MSHA mine 1512077

Current hierarchy: **Mc Peek Chipper → A & T Mining Company Inc → Mine No 1**

- 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:** Johnson Greg → Mine No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Brothers Coal Company Inc → Mine No 1; 1979-10-01 to 1988-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Greg → Johnson Brothers Coal Company Inc; 1979-10-01 to 1988-05-15; source msha-controller-operator-history
- **operator_operates_mine:** A & T Mining Company Inc → Mine No 1; 1988-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Peek Chipper → Mine No 1; 1988-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Peek Chipper → A & T Mining Company Inc; 1988-05-16 to current/open; source msha-controller-operator-history