# Relationship history for MSHA mine 4300423

Current hierarchy: **Douglas R  Casella → CASELLA CONSTRUCTION INC → MENDON WASH PLANT**

- 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:** Crossman'S Sand & Gravel Inc → MENDON WASH PLANT; 1988-10-01 to 1998-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Neil  Crossman → MENDON WASH PLANT; 1988-10-01 to 1998-06-10; source msha-controller-operator-history
- **controller_controls_operator:** Neil  Crossman → Crossman'S Sand & Gravel Inc; 1988-10-01 to 1998-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Casella Construction Inc → MENDON WASH PLANT; 1998-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas R  Casella → MENDON WASH PLANT; 1998-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas R  Casella → Casella Construction Inc; 1998-06-11 to current/open; source msha-controller-operator-history