# Relationship history for MSHA mine 1901146

Current hierarchy: **Terry D.  Heinold → Ground Control Corporation → Chocksett Pit 1**

- 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:** Ground Control Corporation → Chocksett Pit 1; 2006-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry D.  Heinold → Chocksett Pit 1; 2006-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry D.  Heinold → Ground Control Corporation; 2006-01-24 to current/open; source msha-controller-operator-history