# Relationship history for MSHA mine 3607146

Current hierarchy: **H Scott  Whyel → Bridgeview Coal Company → Schmunk Job**

- 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:** H Scott  Whyel → Schmunk Job; 1974-04-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bridgeview Coal Company → Schmunk Job; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H Scott  Whyel → Bridgeview Coal Company; 1981-06-01 to current/open; source msha-controller-operator-history