# Relationship history for MSHA mine 1101894

Current hierarchy: **Tucker Tom → Gibson Materials Company → Tucker Pit-Gibson Materials Co**

- 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:** Gibson Materials Company → Tucker Pit-Gibson Materials Co; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tucker Tom → Tucker Pit-Gibson Materials Co; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tucker Tom → Gibson Materials Company; 1950-01-01 to current/open; source msha-controller-operator-history