# Relationship history for MSHA mine 2602493

Current hierarchy: **Sterling Infrastructure Inc; Richard H  Buenting → Road and Highway Builders, LLC → Hazemag Impact Crusher S/N HU1732**

- 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:** Loren E  Hunewill  et al → Hazemag Impact Crusher S/N HU1732; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H E Hunewill Construction Co Inc → Hazemag Impact Crusher S/N HU1732; 2002-03-21 to 2011-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Loren E  Hunewill  et al → H E Hunewill Construction Co Inc; 2002-03-21 to 2011-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Sterling Infrastructure Inc et al → Hazemag Impact Crusher S/N HU1732; 2009-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Road and Highway Builders, LLC → Hazemag Impact Crusher S/N HU1732; 2011-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sterling Infrastructure Inc et al → Road and Highway Builders, LLC; 2011-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Buenting et al → Road and Highway Builders, LLC; 2011-03-30 to current/open; source msha-controller-operator-history