# Relationship history for MSHA mine 3401899

Current hierarchy: **Michael  Qualls → Corner Stone Quarries, Inc. → Corner Stone - #1 Wister 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:** Corner Stone Quarries, Inc. → Corner Stone - #1 Wister Quarry; 2002-10-03 to 2019-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Jace  Tanguay  et al → Corner Stone - #1 Wister Quarry; 2002-10-03 to 2014-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Jace  Tanguay  et al → Corner Stone Quarries, Inc.; 2002-10-03 to 2014-05-01; source msha-controller-operator-history
- **controller_controls_operator:** W D  Peterson  et al → Corner Stone Quarries, Inc.; 2002-10-03 to 2014-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Jace D  Tanguay → Corner Stone - #1 Wister Quarry; 2014-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jace D  Tanguay → Corner Stone Quarries, Inc.; 2014-05-02 to 2019-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Corner Stone Quarries, Inc. → Corner Stone - #1 Wister Quarry; 2019-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Qualls → Corner Stone - #1 Wister Quarry; 2019-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Qualls → Corner Stone Quarries, Inc.; 2019-08-01 to current/open; source msha-controller-operator-history