# Relationship history for MSHA mine 3201000

Current hierarchy: **Curtis  Vachal; Beau  Vachal → H & K Construction → Crusher #3**

- 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:** Beau  Vachal et al → Crusher #3; 2010-02-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & K Construction → Crusher #3; 2013-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beau  Vachal et al → H & K Construction; 2013-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis  Vachal et al → H & K Construction; 2013-01-22 to current/open; source msha-controller-operator-history