# Relationship history for MSHA mine 4102369

Current hierarchy: **Patrick  Alexander; Michael  O'Connor → Cold Spring Granite Company → Diamond Pearl**

- 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

- **controller_controls_mine:** Patrick  Alexander → Diamond Pearl; 1950-01-01 to 2024-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Capitol Granite Quarries → Diamond Pearl; 1950-01-01 to 1990-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Capitol Granite Quarries → Diamond Pearl; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Capitol Granite Quarries → Capitol Granite Quarries; 1950-01-01 to 1990-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Cold Spring Granite Company → Diamond Pearl; 1990-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick  Alexander → Cold Spring Granite Company; 1990-01-22 to 2024-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Michael  O'Connor → Diamond Pearl; 2024-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  O'Connor → Cold Spring Granite Company; 2024-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick  Alexander → Cold Spring Granite Company; 2024-05-21 to current/open; source msha-controller-operator-history