# Relationship history for MSHA mine 3608404

Current hierarchy: **Chattells Inc → Coal & Minerals Recovery Inc → Isabella Site**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Global Coal Recovery Inc → Isabella Site; 1993-04-01 to 1995-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Guy  Cramer → Isabella Site; 1993-04-01 to 1995-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Guy  Cramer → Global Coal Recovery Inc; 1993-04-01 to 1995-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Coal & Minerals Recovery Inc → Isabella Site; 1995-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chattells Inc → Isabella Site; 1995-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chattells Inc → Coal & Minerals Recovery Inc; 1995-01-30 to current/open; source msha-controller-operator-history