# Relationship history for MSHA mine 1800192

Current hierarchy: **Kristine  Lamkin Weiffenbach → Patapsco Natural Stone Quarry LLC → Patapsco Natural Stone Quarry LLC**

- 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

- **operator_operates_mine:** Piccirilli Quarries → Patapsco Natural Stone Quarry LLC; 1950-01-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Piccirilli William J → Patapsco Natural Stone Quarry LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Piccirilli William J → Piccirilli Quarries; 1950-01-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Agostino J  Vinci → Patapsco Natural Stone Quarry LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vinci Stone Products, Inc → Patapsco Natural Stone Quarry LLC; 2002-04-01 to 2015-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Agostino J  Vinci → Vinci Stone Products, Inc; 2002-04-01 to 2015-08-04; source msha-controller-operator-history
- **operator_operates_mine:** VSP Holdings, LLC → Patapsco Natural Stone Quarry LLC; 2015-08-05 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Francis E  Gardiner III et al → Patapsco Natural Stone Quarry LLC; 2015-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francis E  Gardiner III et al → VSP Holdings, LLC; 2015-08-05 to 2017-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Patapsco Natural Stone Quarry LLC → Patapsco Natural Stone Quarry LLC; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kristine  Lamkin Weiffenbach → Patapsco Natural Stone Quarry LLC; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kristine  Lamkin Weiffenbach → Patapsco Natural Stone Quarry LLC; 2018-01-01 to current/open; source msha-controller-operator-history