# Relationship history for MSHA mine 3002673

Current hierarchy: **John B  Tintle → WAINSCOTT SAND & GRAVEL CORP → WAINSCOTT SAND & GRAVEL CORPORATION**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Bridgehampton Materials & Heavy Equipment Inc → WAINSCOTT SAND & GRAVEL CORPORATION; 1985-01-01 to 1987-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Richard M  Thayer → WAINSCOTT SAND & GRAVEL CORPORATION; 1985-01-01 to 1987-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Richard M  Thayer → Bridgehampton Materials & Heavy Equipment Inc; 1985-01-01 to 1987-10-27; source msha-controller-operator-history
- **controller_controls_mine:** John B  Tintle → WAINSCOTT SAND & GRAVEL CORPORATION; 1985-02-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wainscott Sand & Gravel Corp → WAINSCOTT SAND & GRAVEL CORPORATION; 1987-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John B  Tintle → Wainscott Sand & Gravel Corp; 1987-10-28 to current/open; source msha-controller-operator-history