# Relationship history for MSHA mine 3402263

Current hierarchy: **Daniel W  Davis; Kent M  Dowell → BISON CONSTRUCTION MANAGEMENT, LLC → BCM QUARRY NO. 1**

- 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

- **operator_operates_mine:** BISON CONSTRUCTION MANAGEMENT, LLC → BCM QUARRY NO. 1; 2026-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kent M  Dowell et al → BCM QUARRY NO. 1; 2026-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent M  Dowell et al → BISON CONSTRUCTION MANAGEMENT, LLC; 2026-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel W  Davis et al → BISON CONSTRUCTION MANAGEMENT, LLC; 2026-07-14 to current/open; source msha-controller-operator-history