# Relationship history for MSHA mine 2902542

Current hierarchy: **Gordon  Hays → Hays Plumbing and Heating → Melton 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Hays Plumbing and Heating → Melton Pit; 2023-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gordon  Hays → Melton Pit; 2023-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gordon  Hays → Hays Plumbing and Heating; 2023-01-05 to current/open; source msha-controller-operator-history