# Relationship history for MSHA mine 4002667

Current hierarchy: **X L Construction Company → X C O Corp → No 1**

- 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:** X C O Corp → No 1; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** X L Construction Company → No 1; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** X L Construction Company → X C O Corp; 1981-01-01 to current/open; source msha-controller-operator-history