# Relationship history for MSHA mine 1515324

Current hierarchy: **Robert C  Gregory Sr. → Cross Over Mining Company Inc → No 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:** Robert C  Gregory Sr. → No 2; 1983-03-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cross Over Mining Company Inc → No 2; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Gregory Sr. → Cross Over Mining Company Inc; 1985-08-01 to current/open; source msha-controller-operator-history