# Relationship history for MSHA mine 2902162

Current hierarchy: **Jack R  Ward → Draw Resources → Crewshaw 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** C & R Sand & Gravel → Crewshaw Pit; 1996-07-01 to 2004-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Crenshaw Robert D → Crewshaw Pit; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crenshaw Robert D → C & R Sand & Gravel; 1996-07-01 to 2004-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Draw Resources → Crewshaw Pit; 2004-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jack R  Ward → Crewshaw Pit; 2004-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack R  Ward → Draw Resources; 2004-11-19 to current/open; source msha-controller-operator-history