# Relationship history for MSHA mine 3001675

Current hierarchy: **Brewster Transit Mix Corp → Brewster Sand & Stone Corp → Dutchess Pits**

- 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:** Brewster Sand & Stone Corp → Dutchess Pits; 1950-01-01 to 1985-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Spencer W E → Dutchess Pits; 1950-01-01 to 1985-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Spencer W E → Brewster Sand & Stone Corp; 1950-01-01 to 1985-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Brewster Transit Mix Corp → Dutchess Pits; 1985-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brewster Sand & Stone Corp → Dutchess Pits; 1985-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brewster Transit Mix Corp → Brewster Sand & Stone Corp; 1985-08-20 to current/open; source msha-controller-operator-history