# Relationship history for MSHA mine 4801871

Current hierarchy: **Gordon Dean  Crawford; LeLand Jr. James  Mascaro → Tensleep Sand and Gravel, LLC → Step Rock Pit**

- 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:** Tensleep Sand and Gravel, LLC → Step Rock Pit; 2023-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gordon Dean  Crawford et al → Step Rock Pit; 2023-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gordon Dean  Crawford et al → Tensleep Sand and Gravel, LLC; 2023-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** LeLand Jr. James  Mascaro et al → Tensleep Sand and Gravel, LLC; 2023-11-16 to current/open; source msha-controller-operator-history