# Relationship history for MSHA mine 1504331

Current hierarchy: **Douglas  Warriner → Montana Bakken, LLC → 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

- **operator_operates_mine:** Pathfork-Harlan Coal Company Inc → Prep Plant; 1950-01-01 to 1981-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Champion International Corporation → Prep Plant; 1950-01-01 to 1981-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Champion International Corporation → Pathfork-Harlan Coal Company Inc; 1950-01-01 to 1981-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Manalapan Mining Company Inc → Prep Plant; 1981-11-03 to 2016-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin R.  Bennett → Prep Plant; 1981-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R.  Bennett → Manalapan Mining Company Inc; 1981-11-03 to 2016-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Montana Bakken, LLC → Prep Plant; 2016-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Warriner → Prep Plant; 2016-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Warriner → Montana Bakken, LLC; 2016-07-14 to current/open; source msha-controller-operator-history