# Relationship history for MSHA mine 2902258

Current hierarchy: **Charles D  Drennan; David R  Drennan → Drennan & Son → Drennan & Son Sand & Gravel**

- 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:** Drennan & Son → Drennan & Son Sand & Gravel; 2003-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles D  Drennan  et al → Drennan & Son Sand & Gravel; 2003-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Drennan  et al → Drennan & Son; 2003-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David R  Drennan  et al → Drennan & Son; 2003-10-08 to current/open; source msha-controller-operator-history