# Relationship history for MSHA mine 3101895

Current hierarchy: **Richard M  Smith; Rex Stuart  Smith → Rex Smith Farms Inc → Wood Farm 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

- **operator_operates_mine:** Rex Smith Trucking Company → Wood Farm Pit; 1979-03-01 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** James R  Smith → Wood Farm Pit; 1979-03-01 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_operator:** James R  Smith → Rex Smith Trucking Company; 1979-03-01 to 1997-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Rex Smith Farms Inc → Wood Farm Pit; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rex Stuart  Smith et al → Wood Farm Pit; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rex Stuart  Smith et al → Rex Smith Farms Inc; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard M  Smith et al → Rex Smith Farms Inc; 1997-07-01 to current/open; source msha-controller-operator-history