# Relationship history for MSHA mine 0203371

Current hierarchy: **Stacy  Smith; Keith  Smith → Top Dog Materials → Top Dog Materials**

- 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:** K.S. Excavation → Top Dog Materials; 2017-01-01 to 2018-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Stacy  Smith et al → Top Dog Materials; 2017-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacy  Smith et al → K.S. Excavation; 2017-01-01 to 2018-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Smith et al → K.S. Excavation; 2017-01-01 to 2018-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Top Dog Materials → Top Dog Materials; 2018-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith  Smith et al → Top Dog Materials; 2018-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Smith et al → Top Dog Materials; 2018-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacy  Smith et al → Top Dog Materials; 2018-03-18 to current/open; source msha-controller-operator-history