# Relationship history for MSHA mine 0203107

Current hierarchy: **Maurice R  Tanner Jr → M.R. Tanner Mining Inc → West Side Pit**

- 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:** Maurice R  Tanner Jr → West Side Pit; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M.R. Tanner Mining Inc → West Side Pit; 2005-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maurice R  Tanner Jr → M.R. Tanner Mining Inc; 2005-11-07 to current/open; source msha-controller-operator-history