# Relationship history for MSHA mine 4502527

Current hierarchy: **Tuss Tom → Tuss Crushing Company → Trout Lake 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

- **controller_controls_mine:** Stevenson Bruce R-Mark E & W D Et Al → Trout Lake Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S D S Lumber Company → Trout Lake Pit; 1978-03-09 to 1979-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Stevenson Bruce R-Mark E & W D Et Al → S D S Lumber Company; 1978-03-09 to 1979-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Tuss Crushing Company → Trout Lake Pit; 1979-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tuss Tom → Trout Lake Pit; 1979-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tuss Tom → Tuss Crushing Company; 1979-05-30 to current/open; source msha-controller-operator-history