# Relationship history for MSHA mine 3003279

Current hierarchy: **Colas S A → Upstone Materials Inc. → Wells 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:** Hunt Brothers Inc → Wells Quarry; 1999-06-01 to 2006-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Timothy  Hunt → Wells Quarry; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Hunt → Hunt Brothers Inc; 1999-06-01 to 2006-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Graymont Ltd → Wells Quarry; 2004-06-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Graymont Materials (NY) Inc. → Wells Quarry; 2006-06-05 to 2017-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Graymont Ltd → Graymont Materials (NY) Inc.; 2006-06-05 to 2017-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Wells Quarry; 2017-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Upstone Materials Inc. → Wells Quarry; 2017-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Upstone Materials Inc.; 2017-08-02 to current/open; source msha-controller-operator-history