# Relationship history for MSHA mine 0203260

Current hierarchy: **Alice M  Thomas; Albert D  Thomas → Samoht Rock & Sand, L.L.C. → Samoht Rock & Sand, L.L.C.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Samoht Rock & Sand, L.L.C. → Samoht Rock & Sand, L.L.C.; 2010-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert D  Thomas et al → Samoht Rock & Sand, L.L.C.; 2010-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert D  Thomas et al → Samoht Rock & Sand, L.L.C.; 2010-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alice M  Thomas et al → Samoht Rock & Sand, L.L.C.; 2010-01-27 to current/open; source msha-controller-operator-history