# Relationship history for MSHA mine 2602000

Current hierarchy: **Sterling Infrastructure Inc; Richard H  Buenting → Road and Highway Builders, LLC → Portable Crusher 1004**

- 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 → Portable Crusher 1004; 1950-01-01 to 2003-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Richard D  Ford → Portable Crusher 1004; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Garth  Frehner → Portable Crusher 1004; 1983-08-01 to 2004-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Stocks Mill & Supply Company Inc → Portable Crusher 1004; 1987-03-01 to 1989-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Richard D  Ford → Stocks Mill & Supply Company Inc; 1987-03-01 to 1989-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Southern Nevada Paving → Portable Crusher 1004; 1989-07-17 to 2011-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Floyd A  Meldrum → Southern Nevada Paving; 1989-07-17 to 2003-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Portable Crusher 1004; 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:** Aggregate Industries PLC → Portable Crusher 1004; 2004-05-10 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Portable Crusher 1004; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Portable Crusher 1004; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Southern Nevada Paving; 2009-04-30 to 2011-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Sterling Infrastructure Inc et al → Portable Crusher 1004; 2009-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries SWR → Portable Crusher 1004; 2011-04-20 to 2012-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries SWR; 2011-04-20 to 2012-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Garth  Frehner → Aggregate Industries SWR; 2011-04-20 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries SWR; 2011-04-20 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Road and Highway Builders, LLC → Portable Crusher 1004; 2012-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sterling Infrastructure Inc et al → Road and Highway Builders, LLC; 2012-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Buenting et al → Road and Highway Builders, LLC; 2012-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Portable Crusher 1004; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries SWR; 2015-07-10 to 2012-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Portable Crusher 1004; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries SWR; 2025-06-23 to 2012-03-22; source msha-controller-operator-history