# Relationship history for MSHA mine 0900296

Current hierarchy: **David A  Giannoni → North Ridge Granite Quarries Inc → North Ridge II**

- 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:** Service Granite Company Inc → North Ridge II; 1950-01-01 to 2006-05-10; source msha-controller-operator-history
- **controller_controls_mine:** James Cleve  Miller et al → North Ridge II; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James Cleve  Miller et al → Service Granite Company Inc; 1950-01-01 to 2006-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Carolyn J  Miller et al → Service Granite Company Inc; 1950-01-01 to 2006-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Blue Granite Inc → North Ridge II; 2006-05-11 to 2008-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Carolyn J  Miller → North Ridge II; 2006-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carolyn J  Miller → Lexington Blue Granite Inc; 2006-05-11 to 2008-08-19; source msha-controller-operator-history
- **controller_controls_mine:** David A  Giannoni → North Ridge II; 2007-03-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North Ridge Granite Quarries Inc → North Ridge II; 2008-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Giannoni → North Ridge Granite Quarries Inc; 2008-08-20 to current/open; source msha-controller-operator-history