# Relationship history for MSHA mine 4300242

Current hierarchy: **Perry T Kilbourn → KILBOURN'S EXCAVATING → KILBOURN'S**

- 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:** Tom Kilbourn → KILBOURN'S; 1950-01-01 to 2019-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Kilbourn → KILBOURN'S; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Kilbourn → Tom Kilbourn; 1950-01-01 to 2019-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Kilbourn's Excavating → KILBOURN'S; 2019-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Perry T Kilbourn → KILBOURN'S; 2019-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Perry T Kilbourn → Kilbourn's Excavating; 2019-07-01 to current/open; source msha-controller-operator-history