# Relationship history for MSHA mine 2301385

Current hierarchy: **Fred Weber, Inc. → Jotori Dredging Inc → QUEENFISH**

- 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:** Riverside Sand & Dredging Company → QUEENFISH; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Missouri Gravel Co  et al → QUEENFISH; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Missouri Gravel Co  et al → Riverside Sand & Dredging Company; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Bussen Realty Co et al → Riverside Sand & Dredging Company; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Jotori Dredging Inc → QUEENFISH; 1984-11-01 to 1986-10-15; source msha-controller-operator-history
- **controller_controls_mine:** John R  Weber → QUEENFISH; 1984-11-01 to 1986-10-15; source msha-controller-operator-history
- **controller_controls_operator:** John R  Weber → Jotori Dredging Inc; 1984-11-01 to 1986-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Jotori Dredging Inc → QUEENFISH; 1986-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred Weber, Inc. → QUEENFISH; 1986-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred Weber, Inc. → Jotori Dredging Inc; 1986-10-16 to current/open; source msha-controller-operator-history