# Relationship history for MSHA mine 1508542

Current hierarchy: **John E  Potter → Star Coal Company → No 14 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** France Kermit → No 14 Mine (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John E  Potter et al → No 14 Mine (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & F Coal Company Inc → No 14 Mine (D); 1975-07-01 to 1977-12-15; source msha-controller-operator-history
- **controller_controls_operator:** France Kermit → K & F Coal Company Inc; 1975-07-01 to 1977-12-15; source msha-controller-operator-history
- **operator_operates_mine:** Star Coal Company → No 14 Mine (D); 1977-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E  Potter et al → Star Coal Company; 1977-12-16 to current/open; source msha-controller-operator-history