# Relationship history for MSHA mine 4703973

Current hierarchy: **Rick  Trapp; Nick  Trapp → Highpoint Sand and Gravel LLC → 202501**

- 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:** Scott  Schmitz et al → 202501; 2017-06-07 to 2017-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Trapp et al → 202501; 2017-06-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Highpoint Sand and Gravel LLC → 202501; 2025-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Schmitz et al → Highpoint Sand and Gravel LLC; 2025-04-17 to 2017-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Nick  Trapp et al → Highpoint Sand and Gravel LLC; 2025-04-17 to 2017-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Trapp et al → Highpoint Sand and Gravel LLC; 2025-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick  Trapp et al → Highpoint Sand and Gravel LLC; 2025-04-17 to current/open; source msha-controller-operator-history