# Relationship history for MSHA mine 2301709

Current hierarchy: **Stephen  Rust → Riverstone Quarry, Inc. → Riverstone Quarry/Dawson Plant**

- 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

- **controller_controls_mine:** Wm D  Dawson → Riverstone Quarry/Dawson Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Rust → Riverstone Quarry/Dawson Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & D Stone Inc → Riverstone Quarry/Dawson Plant; 1978-03-09 to 1984-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Charles C  Busch → Riverstone Quarry/Dawson Plant; 1978-03-09 to 1984-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Busch → B & D Stone Inc; 1978-03-09 to 1984-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Wm D Dawson Inc → Riverstone Quarry/Dawson Plant; 1984-05-31 to 2014-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Wm D  Dawson → Wm D Dawson Inc; 1984-05-31 to 2014-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Riverstone Quarry, Inc. → Riverstone Quarry/Dawson Plant; 2014-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Rust → Riverstone Quarry, Inc.; 2014-05-01 to current/open; source msha-controller-operator-history