# Relationship history for MSHA mine 2401920

Current hierarchy: **P M E Corp → P M E Corp → P M E Barton Gulch Project**

- 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:** P M E Corp → P M E Barton Gulch Project; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** P M E Corp → P M E Barton Gulch Project; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** P M E Corp → P M E Corp; 1990-07-01 to current/open; source msha-controller-operator-history