# Relationship history for MSHA mine 1301733

Current hierarchy: **Kevin  Dreher; Charlene  Stewart → Wetherell Excavating & Trucking Inc → Wetherell-Bjorklund Pit**

- 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:** Wetherell Excavating & Trucking Inc → Wetherell-Bjorklund Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charlene  Stewart et al → Wetherell-Bjorklund Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charlene  Stewart et al → Wetherell Excavating & Trucking Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Dreher et al → Wetherell Excavating & Trucking Inc; 1950-01-01 to current/open; source msha-controller-operator-history