# Relationship history for MSHA mine 3608506

Current hierarchy: **Glotfelty Nancy → Bulldog Excavation → Andrews Run Strip**

- 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:** Bulldog Excavation → Andrews Run Strip; 1995-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Glotfelty Nancy → Andrews Run Strip; 1995-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glotfelty Nancy → Bulldog Excavation; 1995-03-01 to current/open; source msha-controller-operator-history