# Relationship history for MSHA mine 4703281

Current hierarchy: **Michael J.  Gonnering; Patti J.  Gonnering → Cloverleaf Sand & Gravel Inc. → Clover Leaf Sand & Gravel Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Cloverleaf Sand & Gravel Inc → Clover Leaf Sand & Gravel Inc.; 2001-08-01 to 2005-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Barry L  Obermeier → Clover Leaf Sand & Gravel Inc.; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barry L  Obermeier → Cloverleaf Sand & Gravel Inc; 2001-08-01 to 2005-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Cloverleaf Sand & Gravel Inc. → Clover Leaf Sand & Gravel Inc.; 2005-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patti J.  Gonnering et al → Clover Leaf Sand & Gravel Inc.; 2005-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patti J.  Gonnering et al → Cloverleaf Sand & Gravel Inc.; 2005-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J.  Gonnering et al → Cloverleaf Sand & Gravel Inc.; 2005-04-08 to current/open; source msha-controller-operator-history