# Relationship history for MSHA mine 0504770

Current hierarchy: **Keith E  Tucker → Tucker Custom Service → TUCKER CUSTOM SERVICE**

- 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

- **operator_operates_mine:** Tucker Custom Service → TUCKER CUSTOM SERVICE; 2003-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith E  Tucker → TUCKER CUSTOM SERVICE; 2003-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith E  Tucker → Tucker Custom Service; 2003-06-30 to current/open; source msha-controller-operator-history