# Relationship history for MSHA mine 4702621

Current hierarchy: **Sawyer County-Wi → Sawyer County Highway Department → Penninsula 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:** Raymond Madson Excavating → Penninsula Pit; 1979-01-01 to 1980-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Madson Raymond → Penninsula Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Madson Raymond → Raymond Madson Excavating; 1979-01-01 to 1980-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Sawyer County-Wi → Penninsula Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sawyer County Highway Department → Penninsula Pit; 1980-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sawyer County-Wi → Sawyer County Highway Department; 1980-04-10 to current/open; source msha-controller-operator-history