# Relationship history for MSHA mine 1202495

Current hierarchy: **Carl H  Pulver → Wolf Lake Gravel Pit → Wolf Lake**

- 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:** Wolf Lake Gravel Pit → Wolf Lake; 2019-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl H  Pulver → Wolf Lake; 2019-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl H  Pulver → Wolf Lake Gravel Pit; 2019-02-04 to current/open; source msha-controller-operator-history