# Relationship history for MSHA mine 2602507

Current hierarchy: **Holcim Ltd → Southern Nevada Paving → Summerlin #8**

- 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:** Floyd A  Meldrum → Summerlin #8; 1950-01-01 to 2003-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Southern Nevada Paving → Summerlin #8; 2002-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Floyd A  Meldrum → Southern Nevada Paving; 2002-10-04 to 2003-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Summerlin #8; 2003-12-15 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Southern Nevada Paving; 2003-12-15 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Summerlin #8; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Southern Nevada Paving; 2009-04-30 to current/open; source msha-controller-operator-history