# Relationship history for MSHA mine 1601530

Current hierarchy: **CRH PLC → National Specialty Aggregates LLC → NSA Wet Plant**

- 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:** National Specialty Aggregates LLC → NSA Wet Plant; 2013-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Jones et al → NSA Wet Plant; 2013-07-09 to 2019-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Jones et al → National Specialty Aggregates LLC; 2013-07-09 to 2019-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Grech et al → National Specialty Aggregates LLC; 2013-07-09 to 2019-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Retjano et al → National Specialty Aggregates LLC; 2013-07-09 to 2019-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Pebble Technology, Inc → NSA Wet Plant; 2019-10-21 to 2021-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Pebble Technology, Inc → National Specialty Aggregates LLC; 2019-10-21 to 2021-11-02; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → NSA Wet Plant; 2021-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → National Specialty Aggregates LLC; 2021-11-03 to current/open; source msha-controller-operator-history