# Relationship history for MSHA mine 3004059

Current hierarchy: **George W Sanford → SANFORD STONE LLC → SILVER LAKE 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

- **controller_controls_mine:** George W Sanford → SILVER LAKE QUARRY; 2017-11-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** All Natural Stone Works LLC → SILVER LAKE QUARRY; 2020-07-15 to 2021-12-20; source msha-controller-operator-history
- **controller_controls_mine:** David L  Brainard → SILVER LAKE QUARRY; 2020-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L  Brainard → All Natural Stone Works LLC; 2020-07-15 to 2021-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Sanford Stone LLC → SILVER LAKE QUARRY; 2021-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George W Sanford → Sanford Stone LLC; 2021-12-21 to current/open; source msha-controller-operator-history