# Relationship history for MSHA mine 1400826

Current hierarchy: **Ronald C  Siebert → Siebert Sand Company Inc → Potts**

- 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:** Siebert Sand Company Inc → Potts; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald C  Siebert → Potts; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald C  Siebert → Siebert Sand Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history