# Relationship history for MSHA mine 3608300

Current hierarchy: **Kenneth R  Eller → Diversified Energy Ventures Inc → Diversified Energy Ventures Inc Pre**

- 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:** Poland Processing Company → Diversified Energy Ventures Inc Pre; 1991-03-01 to 1993-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Garnet Corp & Shannopin Mining Company → Diversified Energy Ventures Inc Pre; 1991-03-01 to 1993-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Garnet Corp & Shannopin Mining Company → Poland Processing Company; 1991-03-01 to 1993-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Diversified Energy Ventures Inc → Diversified Energy Ventures Inc Pre; 1993-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth R  Eller → Diversified Energy Ventures Inc Pre; 1993-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth R  Eller → Diversified Energy Ventures Inc; 1993-02-27 to current/open; source msha-controller-operator-history