# Relationship history for MSHA mine 2302271

Current hierarchy: **Limited Leasing Company; Kimaterials, Inc. → Gateway Dredging and Contracting → Dredge Crystal City**

- 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:** Fred Weber, Inc. → Dredge Crystal City; 1986-10-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jotori Dredging Inc → Dredge Crystal City; 2002-09-03 to 2011-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Fred Weber, Inc. → Jotori Dredging Inc; 2002-09-03 to 2011-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Gateway Dredging and Contracting → Dredge Crystal City; 2011-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David J  Bangert et al → Dredge Crystal City; 2011-05-02 to 2023-06-07; source msha-controller-operator-history
- **controller_controls_operator:** David J  Bangert et al → Gateway Dredging and Contracting; 2011-05-02 to 2023-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Kimaterials, Inc. → Dredge Crystal City; 2023-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kimaterials, Inc. → Gateway Dredging and Contracting; 2023-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Limited Leasing Company → Gateway Dredging and Contracting; 2023-06-08 to current/open; source msha-controller-operator-history