# Relationship history for MSHA mine 2402722

Current hierarchy: **Troy J  Perry → 21 Construction Inc → 21 Mining**

- 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:** 21 Construction Inc → 21 Mining; 2018-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy J  Perry → 21 Mining; 2018-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy J  Perry → 21 Construction Inc; 2018-01-26 to current/open; source msha-controller-operator-history