# Relationship history for MSHA mine 1101202

Current hierarchy: **Fred Weber, Inc. → Quality Sand Inc → City Plant And Mill**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Quality Sand Inc → City Plant And Mill; 1950-01-01 to 1980-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Cletus  Lischer → City Plant And Mill; 1950-01-01 to 1993-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Cletus  Lischer → Quality Sand Inc; 1950-01-01 to 1980-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Quality Sand Inc → City Plant And Mill; 1980-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sand Inc → City Plant And Mill; 1980-07-24 to 2002-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Sand Inc → Quality Sand Inc; 1980-07-24 to 2002-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Fred Weber, Inc. → City Plant And Mill; 2002-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred Weber, Inc. → Quality Sand Inc; 2002-08-01 to current/open; source msha-controller-operator-history