# Relationship history for MSHA mine 4002773

Current hierarchy: **Mitchell Pearl W → Mitchell Mining Company → The Oliver-Twitty 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Mitchell Pearl W → The Oliver-Twitty Mine; 1981-08-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mitchell Mining Company → The Oliver-Twitty Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell Pearl W → Mitchell Mining Company; 1982-03-01 to current/open; source msha-controller-operator-history