# Relationship history for MSHA mine 4702981

Current hierarchy: **Luedtke Roger & Kevin → Luedtke Sand & Gravel → LUEDTKE SAND & 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:** Luedtke Sand & Gravel → LUEDTKE SAND & GRAVEL; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Luedtke Roger & Kevin → LUEDTKE SAND & GRAVEL; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luedtke Roger & Kevin → Luedtke Sand & Gravel; 1993-05-01 to current/open; source msha-controller-operator-history