# Relationship history for MSHA mine 4606987

Current hierarchy: **H E  Jones Jr; Charles T  Jones → Amherst Industries Inc → Chelyan Loading Facility**

- 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:** Amherst Industries Inc → Chelyan Loading Facility; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** H E  Jones Jr et al → Chelyan Loading Facility; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H E  Jones Jr et al → Amherst Industries Inc; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles T  Jones et al → Amherst Industries Inc; 1985-08-01 to current/open; source msha-controller-operator-history