# Relationship history for MSHA mine 4502898

Current hierarchy: **Jones Gary E → Summit Timber Company → 15 Mile Pit**

- 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:** Jones Gary E → 15 Mile Pit; 1978-08-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Summit Timber Company → 15 Mile Pit; 1981-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Gary E → Summit Timber Company; 1981-04-01 to current/open; source msha-controller-operator-history