# Relationship history for MSHA mine 1508196

Current hierarchy: **Potter A C → B P & W Coal Company Inc → No 7 Mine (D)**

- 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:** Potter A C → No 7 Mine (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B P & W Coal Company Inc → No 7 Mine (D); 1975-04-01 to 1979-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Potter A C → B P & W Coal Company Inc; 1975-04-01 to 1979-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Triple A Coal Company → No 7 Mine (D); 1979-10-22 to 1980-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Morgan D → No 7 Mine (D); 1979-10-22 to 1980-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Morgan D → Triple A Coal Company; 1979-10-22 to 1980-03-18; source msha-controller-operator-history
- **operator_operates_mine:** B P & W Coal Company Inc → No 7 Mine (D); 1980-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potter A C → B P & W Coal Company Inc; 1980-03-19 to current/open; source msha-controller-operator-history