# Relationship history for MSHA mine 4103709

Current hierarchy: **Quinn  Fritz; Darin  Fritz → Fritz & Sons Construction → KELLEY RANCH**

- 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:** Fritz & Sons Construction → KELLEY RANCH; 1991-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aaron  Fritz → KELLEY RANCH; 1991-11-01 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Aaron  Fritz → Fritz & Sons Construction; 1991-11-01 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Quinn  Fritz et al → KELLEY RANCH; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quinn  Fritz et al → Fritz & Sons Construction; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darin  Fritz et al → Fritz & Sons Construction; 2013-01-01 to current/open; source msha-controller-operator-history