# Relationship history for MSHA mine 1504569

Current hierarchy: **T W Oil Inc → Adventure Coal Corp → Adventure 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:** Adventure Coal Corp → Adventure Prep Plant; 1950-01-01 to 1976-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Dean Edgar → Adventure Prep Plant; 1950-01-01 to 1976-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Dean Edgar → Adventure Coal Corp; 1950-01-01 to 1976-02-10; source msha-controller-operator-history
- **controller_controls_mine:** T W Oil Inc → Adventure Prep Plant; 1976-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Adventure Coal Corp → Adventure Prep Plant; 1976-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T W Oil Inc → Adventure Coal Corp; 1976-02-11 to current/open; source msha-controller-operator-history