# Relationship history for MSHA mine 0405126

Current hierarchy: **Nrg Energy Jackson Valley I Inc-Volkar/Coombs Part → Jackson Valley Energy Partners L P → Howard Properties Lot 232**

- 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:** Ione Energy Inc → Howard Properties Lot 232; 1991-01-01 to 1991-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Asea Brown Boveri Ltd (ABB) → Howard Properties Lot 232; 1991-01-01 to 1991-07-02; source msha-controller-operator-history
- **controller_controls_operator:** Asea Brown Boveri Ltd (ABB) → Ione Energy Inc; 1991-01-01 to 1991-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Nrg Energy Jackson Valley I Inc-Volkar/Coombs Part → Howard Properties Lot 232; 1991-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jackson Valley Energy Partners L P → Howard Properties Lot 232; 1991-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nrg Energy Jackson Valley I Inc-Volkar/Coombs Part → Jackson Valley Energy Partners L P; 1991-07-03 to current/open; source msha-controller-operator-history