# Relationship history for MSHA mine 2801048

Current hierarchy: **CRH PLC → Tilcon New York Inc. → Tilcon NY-Perth Amboy Sand**

- 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:** CRH PLC → Tilcon NY-Perth Amboy Sand; 1996-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North American Aggregates, LLC → Tilcon NY-Perth Amboy Sand; 2018-05-29 to 2025-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Richard N  Weeks et al → Tilcon NY-Perth Amboy Sand; 2018-05-29 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Richard N  Weeks et al → North American Aggregates, LLC; 2018-05-29 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Richard S  Weeks et al → North American Aggregates, LLC; 2018-05-29 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Infrastructure Group Inc → Tilcon NY-Perth Amboy Sand; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Infrastructure Group Inc → North American Aggregates, LLC; 2023-01-01 to 2025-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon New York Inc. → Tilcon NY-Perth Amboy Sand; 2025-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Tilcon New York Inc.; 2025-12-12 to current/open; source msha-controller-operator-history