# Relationship history for MSHA mine 3608140

Current hierarchy: **Ronald J  Kuperavage → Bell Corp → Bell Corp**

- 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:** Elwood  Swank → Bell Corp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Dudash et al → Bell Corp; 1985-08-01 to 1998-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Dudash Coal Company → Bell Corp; 1990-01-01 to 1998-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Dudash et al → Dudash Coal Company; 1990-01-01 to 1998-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Tracy Coal Company → Bell Corp; 1998-11-24 to 2001-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Greco David D & Thomas G Pavelko → Bell Corp; 1998-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greco David D & Thomas G Pavelko → Tracy Coal Company; 1998-11-24 to 2001-11-19; source msha-controller-operator-history
- **operator_operates_mine:** Split Vein Coal Co. Inc. → Bell Corp; 2001-11-20 to 2006-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Elwood  Swank → Split Vein Coal Co. Inc.; 2001-11-20 to 2006-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Bell Corp → Bell Corp; 2006-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald J  Kuperavage → Bell Corp; 2006-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald J  Kuperavage → Bell Corp; 2006-09-01 to current/open; source msha-controller-operator-history