# Relationship history for MSHA mine 1502215

Current hierarchy: **Williamson Oliver → Hite Preparation Company → No G-16**

- 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:** Hite Preparation Company → No G-16; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Moore Ivle → No G-16; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moore Ivle → Hite Preparation Company; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Hite Preparation Company → No G-16; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williamson Oliver → No G-16; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williamson Oliver → Hite Preparation Company; 1979-01-01 to current/open; source msha-controller-operator-history