# Relationship history for MSHA mine 3200869

Current hierarchy: **Jeff  Carlson → Park Construction → Park Construction**

- 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:** Park Construction → Park Construction; 2010-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Carlson → Park Construction; 2010-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Carlson → Park Construction; 2010-08-19 to current/open; source msha-controller-operator-history