# Relationship history for MSHA mine 4103741

Current hierarchy: **Tom  Alkusari → Alkusari Texas Limestone Corp → NAURET 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Lynn L  Northrup Jr → NAURET QUARRY; 1991-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Limestone Company → NAURET QUARRY; 1992-09-01 to 1995-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Lynn L  Northrup Jr → American Limestone Company; 1992-09-01 to 1995-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Lueders Limestone Quarry → NAURET QUARRY; 1995-08-03 to 1997-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Weldon  Tredemeyer → NAURET QUARRY; 1995-08-03 to 1997-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Weldon  Tredemeyer → Lueders Limestone Quarry; 1995-08-03 to 1997-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Alkusari Texas Limestone Corp → NAURET QUARRY; 1997-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Alkusari → NAURET QUARRY; 1997-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Alkusari → Alkusari Texas Limestone Corp; 1997-09-15 to current/open; source msha-controller-operator-history