# Relationship history for MSHA mine 1103286

Current hierarchy: **Laura  Yoder → SandHill Materials → SandHill 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:** SandHill Materials → SandHill Materials; 2017-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marvin R Yoder → SandHill Materials; 2017-08-22 to 2023-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Marvin R Yoder → SandHill Materials; 2017-08-22 to 2023-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Laura  Yoder → SandHill Materials; 2023-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laura  Yoder → SandHill Materials; 2023-08-09 to current/open; source msha-controller-operator-history