# Relationship history for MSHA mine 3000286

Current hierarchy: **BTR PLC → Tilcon New York Inc → Kingston Quarry & Mill**

- 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:** Colonial Sand & Stone Company Inc → Kingston Quarry & Mill; 1950-01-01 to 1991-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Utilities & Industries Corp → Kingston Quarry & Mill; 1950-01-01 to 1991-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Utilities & Industries Corp → Colonial Sand & Stone Company Inc; 1950-01-01 to 1991-10-15; source msha-controller-operator-history
- **controller_controls_mine:** BTR PLC → Kingston Quarry & Mill; 1981-01-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon New York Inc → Kingston Quarry & Mill; 1991-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BTR PLC → Tilcon New York Inc; 1991-10-16 to current/open; source msha-controller-operator-history