# Relationship history for MSHA mine 4400020

Current hierarchy: **Joao  Thomazini; Jhonatan  Thomazini → Virginia Black Granite Inc → BUENA BLACK 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 → BUENA BLACK QUARRY; 1950-01-01 to 1994-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Tyler George B → BUENA BLACK 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 1994-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Black Granite Inc → BUENA BLACK QUARRY; 1994-04-20 to 1997-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Tenvik Rolf & Patrick Purcell → BUENA BLACK QUARRY; 1994-04-20 to 1997-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Tenvik Rolf & Patrick Purcell → Virginia Black Granite Inc; 1994-04-20 to 1997-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Black Granite Inc → BUENA BLACK QUARRY; 1997-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stone Connection Inc → BUENA BLACK QUARRY; 1997-04-12 to 2018-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Stone Connection Inc → Virginia Black Granite Inc; 1997-04-12 to 2018-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Finstone Group → BUENA BLACK QUARRY; 2018-10-22 to 2022-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Finstone Group → Virginia Black Granite Inc; 2018-10-22 to 2022-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Jhonatan  Thomazini et al → BUENA BLACK QUARRY; 2022-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jhonatan  Thomazini et al → Virginia Black Granite Inc; 2022-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joao  Thomazini et al → Virginia Black Granite Inc; 2022-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Anand Su Anandan et al → BUENA BLACK 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 1994-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Lakshmi  Anandan et al → Century Granite Company Inc; 2023-10-10 to 1994-04-19; source msha-controller-operator-history