# Relationship history for MSHA mine 0901136

Current hierarchy: **Mike  Strock; John  Farrar → Architectural Stone Inc → OCEAN BLUE 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Architectural Stone Inc → OCEAN BLUE QUARRY; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Strock  et al → OCEAN BLUE QUARRY; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Strock  et al → Architectural Stone Inc; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Farrar  et al → Architectural Stone Inc; 2001-05-01 to current/open; source msha-controller-operator-history