# Relationship history for MSHA mine 3610276

Current hierarchy: **Michael  Rich; John J Rich; Brian R Rich → Admiral Carbon, LLC → Glen Burn 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Edward  Helfrich et al → Glen Burn Mine; 1971-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mallard Contracting Co. Inc. → Glen Burn Mine; 2019-03-11 to 2023-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Helfrich et al → Mallard Contracting Co. Inc.; 2019-03-11 to 2023-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Admiral Carbon, LLC → Glen Burn Mine; 2023-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Rich et al → Glen Burn Mine; 2023-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Rich et al → Admiral Carbon, LLC; 2023-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian R Rich et al → Admiral Carbon, LLC; 2023-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John J Rich et al → Admiral Carbon, LLC; 2023-04-19 to current/open; source msha-controller-operator-history