# Relationship history for MSHA mine 0900727

Current hierarchy: **Donald  Conte → Georgia Stone Management LLC → Midnight Grey**

- 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:** S & S Granite Company Inc → Midnight Grey; 1950-01-01 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Smith Zelphia S → Midnight Grey; 1950-01-01 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Smith Zelphia S → S & S Granite Company Inc; 1950-01-01 to 1980-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Locke'S Quarry Inc → Midnight Grey; 1981-01-01 to 1990-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Locke Benny N → Midnight Grey; 1981-01-01 to 1990-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Locke Benny N → Locke'S Quarry Inc; 1981-01-01 to 1990-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Antonio C  Ramos → Midnight Grey; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New England Stone Industries Inc → Midnight Grey; 1990-01-26 to 2007-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Antonio C  Ramos → New England Stone Industries Inc; 1990-01-26 to 2007-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Antonio C  Ramos → Midnight Grey; 1997-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Industries Inc → Midnight Grey; 2007-08-01 to 2024-09-09; source msha-controller-operator-history
- **controller_controls_operator:** Antonio C  Ramos → Georgia Stone Industries Inc; 2007-08-01 to 2024-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Management LLC → Midnight Grey; 2024-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Conte → Midnight Grey; 2024-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Conte → Georgia Stone Management LLC; 2024-09-10 to current/open; source msha-controller-operator-history