# Relationship history for MSHA mine 2902338

Current hierarchy: **John Randolph  Hoffman; Ina May  Hoffman → BRIM Rock & Gravel → BRIM Rock & 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:** BRIM Rock & Gravel → BRIM Rock & Gravel; 2007-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ina May  Hoffman  et al → BRIM Rock & Gravel; 2007-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ina May  Hoffman  et al → BRIM Rock & Gravel; 2007-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Randolph  Hoffman  et al → BRIM Rock & Gravel; 2007-06-14 to current/open; source msha-controller-operator-history