# Relationship history for MSHA mine 1001946

Current hierarchy: **Jack J  Rogers; Mary R  Rogers → Gravel Werks → Gravel Werks**

- 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:** Allied Industries Inc → Gravel Werks; 1999-01-01 to 2003-10-29; source msha-controller-operator-history
- **controller_controls_mine:** R George  Taylor → Gravel Werks; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R George  Taylor → Allied Industries Inc; 1999-01-01 to 2003-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Gravel Werks → Gravel Werks; 2003-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jack J  Rogers  et al → Gravel Werks; 2003-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack J  Rogers  et al → Gravel Werks; 2003-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary R  Rogers  et al → Gravel Werks; 2003-10-30 to current/open; source msha-controller-operator-history