# Relationship history for MSHA mine 2901976

Current hierarchy: **Henderson Stephen W → Steve Henderson Construction Material Inc → Henderson Pit**

- 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

- **operator_operates_mine:** Steve Henderson Construction Material Inc → Henderson Pit; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henderson Stephen W → Henderson Pit; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henderson Stephen W → Steve Henderson Construction Material Inc; 1984-10-01 to current/open; source msha-controller-operator-history