# Relationship history for MSHA mine 2302541

Current hierarchy: **Summit Materials LLC → ConAgg Companies LLC → Norris Quarries Plant #02**

- 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

- **controller_controls_mine:** Con-Agg Llc → Norris Quarries Plant #02; 2001-12-28 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Norris Quarries Plant #02; 2010-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ConAgg Companies LLC → Norris Quarries Plant #02; 2020-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Con-Agg Llc → ConAgg Companies LLC; 2020-02-27 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → ConAgg Companies LLC; 2020-02-27 to current/open; source msha-controller-operator-history