# Relationship history for MSHA mine 1515484

Current hierarchy: **Moore Gilbert → Whitley Gap Mining Inc → #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

- **operator_operates_mine:** C Y Smith Inc → #2; 1986-01-01 to 1988-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Smith C Y → #2; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith C Y → C Y Smith Inc; 1986-01-01 to 1988-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Whitley Gap Mining Inc → #2; 1988-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Moore Gilbert → #2; 1988-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moore Gilbert → Whitley Gap Mining Inc; 1988-04-10 to current/open; source msha-controller-operator-history