# Relationship history for MSHA mine 4703815

Current hierarchy: **Leonard  Frens → Frens Stone, LLC → Kamphis 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

- **operator_operates_mine:** Frens Stone, LLC → Kamphis Quarry; 2017-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leonard  Frens → Kamphis Quarry; 2017-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Frens → Frens Stone, LLC; 2017-11-29 to current/open; source msha-controller-operator-history