# Relationship history for MSHA mine 3003355

Current hierarchy: **Joseph L  Virkler → V.S. Virkler & Son, Inc. → VIRKLER'S LOWVILLE LIMESTONE 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Joseph L  Virkler → VIRKLER'S LOWVILLE LIMESTONE QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul H  Lyndaker → VIRKLER'S LOWVILLE LIMESTONE QUARRY; 1987-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lyndaker Excavating & Trucking Llc → VIRKLER'S LOWVILLE LIMESTONE QUARRY; 2001-02-01 to 2004-12-22; source msha-controller-operator-history
- **controller_controls_operator:** Paul H  Lyndaker → Lyndaker Excavating & Trucking Llc; 2001-02-01 to 2004-12-22; source msha-controller-operator-history
- **operator_operates_mine:** V.S. Virkler & Son, Inc. → VIRKLER'S LOWVILLE LIMESTONE QUARRY; 2004-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph L  Virkler → V.S. Virkler & Son, Inc.; 2004-12-23 to current/open; source msha-controller-operator-history