# Relationship history for MSHA mine 1900008

Current hierarchy: **Donald  Conte → Georgia Stone Management LLC → Chelmsford 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

- **operator_operates_mine:** H E Fletcher Company → Chelmsford Quarry; 1950-01-01 to 1985-11-26; source msha-controller-operator-history
- **controller_controls_mine:** Herbert E  Fletcher → Chelmsford Quarry; 1950-01-01 to 1989-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Herbert E  Fletcher → H E Fletcher Company; 1950-01-01 to 1985-11-26; source msha-controller-operator-history
- **operator_operates_mine:** Fletcher Granite Company Inc → Chelmsford Quarry; 1985-11-27 to 1989-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Paul A  Keany → Chelmsford Quarry; 1985-11-27 to 1991-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Paul A  Keany → Fletcher Granite Company Inc; 1985-11-27 to 1989-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Fletcher Granite Company Inc → Chelmsford Quarry; 1989-01-03 to 1999-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → Chelmsford Quarry; 1989-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Fletcher Granite Company Inc; 1989-01-03 to 1999-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Antonio C  Ramos → Chelmsford Quarry; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** V B  Castellani  et al → Chelmsford Quarry; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fletcher Granite Co LLC → Chelmsford Quarry; 1999-04-02 to 2010-11-15; source msha-controller-operator-history
- **controller_controls_operator:** V B  Castellani  et al → Fletcher Granite Co LLC; 1999-04-02 to 2010-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Kathleen  Herbert et al → Fletcher Granite Co LLC; 1999-04-02 to 2010-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Industries, Inc. → Chelmsford Quarry; 2010-11-16 to 2025-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Antonio C  Ramos → Georgia Stone Industries, Inc.; 2010-11-16 to 2025-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Conte → Chelmsford Quarry; 2024-09-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Management LLC → Chelmsford Quarry; 2025-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Conte → Georgia Stone Management LLC; 2025-01-05 to current/open; source msha-controller-operator-history