# Relationship history for MSHA mine 1701021

Current hierarchy: **Matthew Douglas  Jones → Cross Excavation → Bethel Airport 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:** Cross Excavation → Bethel Airport Pit; 2019-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas Walter  Jones → Bethel Airport Pit; 2019-04-22 to 2024-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Douglas Walter  Jones → Cross Excavation; 2019-04-22 to 2024-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Matthew Douglas  Jones → Bethel Airport Pit; 2024-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew Douglas  Jones → Cross Excavation; 2024-09-28 to current/open; source msha-controller-operator-history