# Relationship history for MSHA mine 4300577

Current hierarchy: **Kristy J  Snow; Jason J  Snow → SNOWSTONE LLC → ALLARD QUARRY**

- 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:** Brown Construction Co. Inc. → ALLARD QUARRY; 2002-05-23 to 2011-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Ronald E  Brown → ALLARD QUARRY; 2002-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald E  Brown → Brown Construction Co. Inc.; 2002-05-23 to 2011-10-17; source msha-controller-operator-history
- **operator_operates_mine:** SnowStone LLC → ALLARD QUARRY; 2011-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kristy J  Snow et al → ALLARD QUARRY; 2011-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kristy J  Snow et al → SnowStone LLC; 2011-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason J  Snow et al → SnowStone LLC; 2011-10-18 to current/open; source msha-controller-operator-history