# Relationship history for MSHA mine 3200976

Current hierarchy: **Kevin  Buehner; Kevin  Buehner; Amos  Buehner; Amos  Buehner → Buehner Construction LLP → B Pit Crusher 2**

- 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:** Amos  Buehner  et al → B Pit Crusher 2; 2008-07-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Buehner Construction LLP → B Pit Crusher 2; 2012-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amos  Buehner  et al → Buehner Construction LLP; 2012-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Buehner  et al → Buehner Construction LLP; 2012-06-11 to current/open; source msha-controller-operator-history