# Relationship history for MSHA mine 4202582

Current hierarchy: **Gregory  Kofford → Amnor Energy Corp → Coyote Knoll Mine**

- 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:** Amnor Energy Corp → Coyote Knoll Mine; 2012-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gregory  Kofford et al → Coyote Knoll Mine; 2012-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory  Kofford et al → Amnor Energy Corp; 2012-03-28 to current/open; source msha-controller-operator-history