# Relationship history for MSHA mine 2103894

Current hierarchy: **Bradley D Visser; Gary E Visser → Visser Trenching Inc → Plant #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Visser Trenching Inc → Plant #1; 2016-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary E Visser et al → Plant #1; 2016-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary E Visser et al → Visser Trenching Inc; 2016-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradley D Visser et al → Visser Trenching Inc; 2016-07-13 to current/open; source msha-controller-operator-history