# Relationship history for MSHA mine 3002615

Current hierarchy: **Jonathan  LaFever → LA FEVER SAND & GRAVEL, LLC → POWER SCREEN CHIEFTAIN 1400**

- 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:** La Fever Excavating Inc → POWER SCREEN CHIEFTAIN 1400; 1981-07-01 to 1986-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Howard J  LaFever → POWER SCREEN CHIEFTAIN 1400; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard J  LaFever → La Fever Excavating Inc; 1981-07-01 to 1986-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Jonathan  LaFever → POWER SCREEN CHIEFTAIN 1400; 1986-05-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** La Fever Excavating Inc → POWER SCREEN CHIEFTAIN 1400; 1986-05-22 to 2002-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  LaFever → La Fever Excavating Inc; 1986-05-22 to 2002-12-31; source msha-controller-operator-history
- **operator_operates_mine:** La Fever Sand & Gravel, LLC → POWER SCREEN CHIEFTAIN 1400; 2003-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jonathan  LaFever → POWER SCREEN CHIEFTAIN 1400; 2003-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  LaFever → La Fever Sand & Gravel, LLC; 2003-01-01 to current/open; source msha-controller-operator-history