# Relationship history for MSHA mine 1518667

Current hierarchy: **Marty Jay  Gray → Gray's Excavating Inc → No 2 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

- **controller_controls_mine:** Marty Jay  Gray → No 2 Mine; 2000-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gray's Excavating Inc → No 2 Mine; 2003-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marty Jay  Gray → Gray's Excavating Inc; 2003-09-15 to current/open; source msha-controller-operator-history