# Relationship history for MSHA mine 2900641

Current hierarchy: **Vincent J  Lardner III → New Mexico Travertine Inc → Sais 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

- **operator_operates_mine:** New Mexico Quarries Inc → Sais Quarry; 1996-07-01 to 2006-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Lardner Timothy J & John P Et Al → Sais Quarry; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lardner Timothy J & John P Et Al → New Mexico Quarries Inc; 1996-07-01 to 2006-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Timothy J  Lardner → Sais Quarry; 2000-02-01 to 2011-01-23; source msha-controller-operator-history
- **operator_operates_mine:** New Mexico Travertine Inc → Sais Quarry; 2006-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy J  Lardner → New Mexico Travertine Inc; 2006-07-21 to 2011-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Vincent J  Lardner III et al → Sais Quarry; 2011-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent J  Lardner III et al → New Mexico Travertine Inc; 2011-01-24 to current/open; source msha-controller-operator-history