# Relationship history for MSHA mine 1518260

Current hierarchy: **Marty Jay  Gray → Gray'S Excavating Inc → Muddy Gap Surface Mine**

- 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:** Gray'S Excavating Inc → Muddy Gap Surface Mine; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marty Jay  Gray → Muddy Gap Surface Mine; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marty Jay  Gray → Gray'S Excavating Inc; 2000-05-01 to current/open; source msha-controller-operator-history