# Relationship history for MSHA mine 4703036

Current hierarchy: **Donald  Boon → Boon Construction, Inc. → Plant No. 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:** Donald  Boon et al → Plant No. 2; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boon Construction, Inc. → Plant No. 2; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Boon et al → Boon Construction, Inc.; 1994-09-01 to current/open; source msha-controller-operator-history