# Relationship history for MSHA mine 3609328

Current hierarchy: **Kevin E  Johnson; Grayling  Johnson → Johnson Brothers Quarry → Kishbaugh Quarry**

- 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:** Kevin E  Johnson et al → Kishbaugh Quarry; 2001-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Brothers Quarry → Kishbaugh Quarry; 2005-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin E  Johnson et al → Johnson Brothers Quarry; 2005-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grayling  Johnson et al → Johnson Brothers Quarry; 2005-05-05 to current/open; source msha-controller-operator-history