# Relationship history for MSHA mine 0900746

Current hierarchy: **Lakshmi  Anandan; Anand Su Anandan → Century Granite Company Inc → Monarch 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:** Century Granite Company Inc → Monarch Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tyler George B → Monarch Quarry; 1950-01-01 to 2023-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Tyler George B → Century Granite Company Inc; 1950-01-01 to 2023-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Anand Su Anandan et al → Monarch Quarry; 2023-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anand Su Anandan et al → Century Granite Company Inc; 2023-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lakshmi  Anandan et al → Century Granite Company Inc; 2023-10-10 to current/open; source msha-controller-operator-history