# Relationship history for MSHA mine 2600838

Current hierarchy: **Sterling Infrastructure Inc; Richard H  Buenting → Road and Highway Builders, LLC → Canica Impact Crusher S/N105130-94**

- 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

- **operator_operates_mine:** Chromalloy Mining & Minerals Inc → Canica Impact Crusher S/N105130-94; 1950-01-01 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Chromalloy American Corp → Canica Impact Crusher S/N105130-94; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chromalloy American Corp → Chromalloy Mining & Minerals Inc; 1950-01-01 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Loren E  Hunewill  et al → Canica Impact Crusher S/N105130-94; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H E Hunewill Construction Company Inc → Canica Impact Crusher S/N105130-94; 1997-07-01 to 2009-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Loren E  Hunewill  et al → H E Hunewill Construction Company Inc; 1997-07-01 to 2009-11-19; source msha-controller-operator-history
- **operator_operates_mine:** Road and Highway Builders, LLC → Canica Impact Crusher S/N105130-94; 2009-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard H  Buenting et al → Canica Impact Crusher S/N105130-94; 2009-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Buenting et al → Road and Highway Builders, LLC; 2009-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sterling Infrastructure Inc et al → Road and Highway Builders, LLC; 2009-11-20 to current/open; source msha-controller-operator-history