# Relationship history for MSHA mine 1100221

Current hierarchy: **Shakespeare Oil Company Inc → Twin Rivers Stone, LLC → Kane 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:** St Charles Sand Company → Kane Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valstad Quarry, Inc. → Kane Plant; 1950-01-01 to 2005-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Harold M  Valstad → Kane Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold M  Valstad → Valstad Quarry, Inc.; 1950-01-01 to 2005-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Kimaterials Inc → Kane Plant; 2005-04-08 to 2018-02-15; source msha-controller-operator-history
- **controller_controls_operator:** St Charles Sand Company → Kimaterials Inc; 2005-04-08 to 2018-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Twin Rivers Stone, LLC → Kane Plant; 2018-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shakespeare Oil Company Inc → Kane Plant; 2018-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shakespeare Oil Company Inc → Twin Rivers Stone, LLC; 2018-02-16 to current/open; source msha-controller-operator-history