# Relationship history for MSHA mine 1901136

Current hierarchy: **Bryce  Ribken → SISYPHUS STONE COMPANY, INC → SUGARLEDGE STONE 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:** Sugarledge Stone Quarry Inc. → SUGARLEDGE STONE QUARRY; 2004-06-08 to 2023-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Jonathan G  Cranston → SUGARLEDGE STONE QUARRY; 2004-06-08 to 2022-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan G  Cranston → Sugarledge Stone Quarry Inc.; 2004-06-08 to 2022-12-27; source msha-controller-operator-history
- **controller_controls_mine:** Bryce  Ribken → SUGARLEDGE STONE QUARRY; 2022-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryce  Ribken → Sugarledge Stone Quarry Inc.; 2022-12-28 to 2023-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Sisyphus Stone Company, Inc → SUGARLEDGE STONE QUARRY; 2023-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryce  Ribken → SUGARLEDGE STONE QUARRY; 2023-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryce  Ribken → Sisyphus Stone Company, Inc; 2023-02-02 to current/open; source msha-controller-operator-history