# Relationship history for MSHA mine 3606499

Current hierarchy: **Kline Ted → Don'S Excavating Company → Dunlap 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:** Don'S Excavating → Dunlap Strip; 1977-08-01 to 1982-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Linsenbigler Donald → Dunlap Strip; 1977-08-01 to 1982-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Linsenbigler Donald → Don'S Excavating; 1977-08-01 to 1982-03-23; source msha-controller-operator-history
- **operator_operates_mine:** Don'S Excavating Company → Dunlap Strip; 1982-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kline Ted → Dunlap Strip; 1982-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kline Ted → Don'S Excavating Company; 1982-03-24 to current/open; source msha-controller-operator-history