# Relationship history for MSHA mine 4502903

Current hierarchy: **Slagal Ernest → S & T Construction → Quilcene 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:** Slagal Ernest → Quilcene Pit; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & T Construction → Quilcene Pit; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Slagal Ernest → S & T Construction; 1981-05-01 to current/open; source msha-controller-operator-history