# Relationship history for MSHA mine 2601546

Current hierarchy: **La Marr Ken → Mingus La Marr Mining Corp → WILLOW CREEK**

- 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:** Isaac & Smith Inc → WILLOW CREEK; 1950-01-01 to 1996-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Isaac J Marvin & Frank Smith → WILLOW CREEK; 1950-01-01 to 1996-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Isaac J Marvin & Frank Smith → Isaac & Smith Inc; 1950-01-01 to 1996-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Mingus La Marr Mining Corp → WILLOW CREEK; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** La Marr Ken → WILLOW CREEK; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** La Marr Ken → Mingus La Marr Mining Corp; 1996-05-01 to current/open; source msha-controller-operator-history