# Relationship history for MSHA mine 1401839

Current hierarchy: **Duane K  McCoy → McCoy Rock Quarry → Pit #2**

- 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

- **controller_controls_mine:** Duane K  McCoy et al → Pit #2; 2015-02-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McCoy Rock Quarry → Pit #2; 2023-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duane K  McCoy et al → McCoy Rock Quarry; 2023-09-06 to current/open; source msha-controller-operator-history