# Relationship history for MSHA mine 3002638

Current hierarchy: **Jonathan  LaFever → La Fever Excavating Inc → KOLMAN SCREENING PLANT**

- 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:** Howard J  LaFever → KOLMAN SCREENING PLANT; 1981-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** La Fever Excavating Inc → KOLMAN SCREENING PLANT; 1983-10-01 to 1986-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Howard J  LaFever → La Fever Excavating Inc; 1983-10-01 to 1986-05-20; source msha-controller-operator-history
- **operator_operates_mine:** La Fever Excavating Inc → KOLMAN SCREENING PLANT; 1986-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jonathan  LaFever → KOLMAN SCREENING PLANT; 1986-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  LaFever → La Fever Excavating Inc; 1986-05-21 to current/open; source msha-controller-operator-history