# Relationship history for MSHA mine 1502699

Current hierarchy: **Taylor Frank → Runyon & Taylor Coal Company → Mine No 6**

- 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

- **operator_operates_mine:** Runyon & Taylor Coal Company → Mine No 6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Frank → Mine No 6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Frank → Runyon & Taylor Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history