# Relationship history for MSHA mine 4300409

Current hierarchy: **Douglas R  Casella → Casella Construction Inc → 7304/7001/7005**

- 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:** Earth Waste Systems Inc → 7304/7001/7005; 1987-05-01 to 1999-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Frank P  Elnicki  et al → 7304/7001/7005; 1987-05-01 to 1999-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Frank P  Elnicki  et al → Earth Waste Systems Inc; 1987-05-01 to 1999-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Douglas R  Casella → 7304/7001/7005; 1998-06-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Casella Construction Inc → 7304/7001/7005; 1999-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas R  Casella → Casella Construction Inc; 1999-06-16 to current/open; source msha-controller-operator-history