# Relationship history for MSHA mine 4609006

Current hierarchy: **Parkstone Energy LLC → Siata, LLC → Essex Mine**

- 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:** B Douglas  Divita → Essex Mine; 1991-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James M  Smith → Essex Mine; 2002-01-01 to 2006-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Siata Equipment Company → Essex Mine; 2003-09-29 to 2003-12-28; source msha-controller-operator-history
- **controller_controls_operator:** James M  Smith → Siata Equipment Company; 2003-09-29 to 2003-12-28; source msha-controller-operator-history
- **operator_operates_mine:** West-Burg Mining, Inc. → Essex Mine; 2003-12-29 to 2004-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Jimmie R  Ryan et al → Essex Mine; 2003-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmie R  Ryan et al → West-Burg Mining, Inc.; 2003-12-29 to 2004-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Divita Coal Co → Essex Mine; 2004-08-09 to 2005-08-16; source msha-controller-operator-history
- **controller_controls_operator:** B Douglas  Divita → Divita Coal Co; 2004-08-09 to 2005-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Maptona, Inc. → Essex Mine; 2005-08-17 to 2006-02-16; source msha-controller-operator-history
- **controller_controls_mine:** B Douglas  Divita → Essex Mine; 2005-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B Douglas  Divita → Maptona, Inc.; 2005-08-17 to 2006-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Siata, LLC → Essex Mine; 2006-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James M  Smith → Siata, LLC; 2006-02-17 to 2006-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Parkstone Energy LLC → Essex Mine; 2006-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parkstone Energy LLC → Siata Equipment Company; 2006-02-17 to 2003-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Parkstone Energy LLC → Siata, LLC; 2006-02-17 to current/open; source msha-controller-operator-history