# Relationship history for MSHA mine 0405181

Current hierarchy: **Brown James A Sr → Valley Material & Supply Company Inc → ACORN SAND & MATERIALS**

- 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:** Pala Band Of Mission Indians → ACORN SAND & MATERIALS; 1992-01-01 to 1992-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Pala Band Of Mission Indians → ACORN SAND & MATERIALS; 1992-01-01 to 1992-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Pala Band Of Mission Indians → Pala Band Of Mission Indians; 1992-01-01 to 1992-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Valley Material & Supply Company Inc → ACORN SAND & MATERIALS; 1992-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown James A Sr → ACORN SAND & MATERIALS; 1992-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown James A Sr → Valley Material & Supply Company Inc; 1992-08-04 to current/open; source msha-controller-operator-history