# Relationship history for MSHA mine 3401400

Current hierarchy: **Summit Materials LLC → Cornejo & Sons LLC → STEWART STONE MITCHELL**

- 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

- **controller_controls_mine:** Larry L  Stewart et al → STEWART STONE MITCHELL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stewart Stone, Inc. → STEWART STONE MITCHELL; 1983-03-01 to 2025-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Larry L  Stewart et al → Stewart Stone, Inc.; 1983-03-01 to 2025-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → STEWART STONE MITCHELL; 2011-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cornejo & Sons LLC → STEWART STONE MITCHELL; 2025-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Cornejo & Sons LLC; 2025-12-12 to current/open; source msha-controller-operator-history