# Relationship history for MSHA mine 3901037

Current hierarchy: **I B Jennings Construction Compa → I B Jennings Construction Compa → Evans Pit**

- 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:** I B Jennings Construction Compa → Evans Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** I B Jennings Construction Compa → Evans Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** I B Jennings Construction Compa → I B Jennings Construction Compa; 1950-01-01 to current/open; source msha-controller-operator-history