# Relationship history for MSHA mine 3003092

Current hierarchy: **Michelle  Stocking; Mike  Stocking → KUKENBERGER SAND & GRAVEL → KUKENBERGER SAND AND GRAVEL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Kukenberger Sand & Gravel → KUKENBERGER SAND AND GRAVEL; 1993-09-01 to 2016-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Mary  Kukenberger et al → KUKENBERGER SAND AND GRAVEL; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary  Kukenberger et al → Kukenberger Sand & Gravel; 1993-09-01 to 2016-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Kukenberger et al → Kukenberger Sand & Gravel; 1993-09-01 to 2016-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Kukenberger Sand & Gravel → KUKENBERGER SAND AND GRAVEL; 2016-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Stocking → KUKENBERGER SAND AND GRAVEL; 2016-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Stocking → Kukenberger Sand & Gravel; 2016-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michelle  Stocking → Kukenberger Sand & Gravel; 2016-09-27 to current/open; source msha-controller-operator-history