# Relationship history for MSHA mine 4703792

Current hierarchy: **Gary  Guerndt → PGA INC. → KPI Crusher**

- 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:** PGA INC. → KPI Crusher; 2016-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Guerndt → KPI Crusher; 2016-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Guerndt → PGA INC.; 2016-11-21 to current/open; source msha-controller-operator-history