# Relationship history for MSHA mine 5001191

Current hierarchy: **Atkinson George E Jr → Big Lake Sand & Gravel Inc → Snow Pit #1**

- 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:** Big Lake Sand & Gravel Inc → Snow Pit #1; 1950-01-01 to 1985-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Belarde John J → Snow Pit #1; 1950-01-01 to 1985-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Belarde John J → Big Lake Sand & Gravel Inc; 1950-01-01 to 1985-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Big Lake Sand & Gravel Inc → Snow Pit #1; 1985-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Atkinson George E Jr → Snow Pit #1; 1985-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atkinson George E Jr → Big Lake Sand & Gravel Inc; 1985-09-24 to current/open; source msha-controller-operator-history