# Relationship history for MSHA mine 0801270

Current hierarchy: **J R  Parish → J & B Sand Company → RUTH'S WHITE SAND**

- 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:** J & B Sand Company → RUTH'S WHITE SAND; 1998-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J R  Parish → RUTH'S WHITE SAND; 1998-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J R  Parish → J & B Sand Company; 1998-12-01 to current/open; source msha-controller-operator-history