# Relationship history for MSHA mine 1601377

Current hierarchy: **John M  Durbin; Ronda  Durbin → P & J Sand & Gravel, LLC → P & J 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:** P & J Sand & Gravel LLC → P & J Sand & Gravel; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John M  Durbin et al → P & J Sand & Gravel; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Durbin et al → P & J Sand & Gravel LLC; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronda  Durbin et al → P & J Sand & Gravel LLC; 2001-04-01 to current/open; source msha-controller-operator-history