# Relationship history for MSHA mine 3609051

Current hierarchy: **J Clifford  Forrest III → Rosebud Mining Company → Bigler Prep Plant**

- 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:** J Clifford  Forrest III → Bigler Prep Plant; 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Bigler Prep Plant; 1982-09-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Resources Inc → Bigler Prep Plant; 2001-11-20 to 2008-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → Energy Resources Inc; 2001-11-20 to 2008-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Rosebud Mining Company → Bigler Prep Plant; 2008-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Clifford  Forrest III → Rosebud Mining Company; 2008-06-30 to current/open; source msha-controller-operator-history