# Relationship history for MSHA mine 2003245

Current hierarchy: **Andrew  Schmidt → Quality Excavating & Equipment Leasing → KOLBERG PORTABLE WASH 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Fred  Birnbaum et al → KOLBERG PORTABLE WASH PLANT; 2000-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J.K. INDUSTRIAL PROCESSING L.L.C. → KOLBERG PORTABLE WASH PLANT; 2002-05-17 to 2003-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Birnbaum et al → J.K. INDUSTRIAL PROCESSING L.L.C.; 2002-05-17 to 2003-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Quality Excavating & Equipment Leasing → KOLBERG PORTABLE WASH PLANT; 2003-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andrew  Schmidt → KOLBERG PORTABLE WASH PLANT; 2003-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Schmidt → Quality Excavating & Equipment Leasing; 2003-05-01 to current/open; source msha-controller-operator-history