# Relationship history for MSHA mine 3601301

Current hierarchy: **David  Kovach → Cobra Mining LLC → Cobra 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Dunkard Mining Company → Cobra Mine; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Raymond  Chess → Cobra Mine; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Chess → Dunkard Mining Company; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Dunkard Mining Company → Cobra Mine; 1976-01-01 to 1983-12-31; source msha-controller-operator-history
- **controller_controls_mine:** James E  Bergesen → Cobra Mine; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James E  Bergesen → Dunkard Mining Company; 1976-01-01 to 1983-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Dunkard Mining Company → Cobra Mine; 1984-01-01 to 1986-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Prodeco Investments Inc → Cobra Mine; 1984-01-01 to 1986-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Prodeco Investments Inc → Dunkard Mining Company; 1984-01-01 to 1986-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Bow Valley Industries Ltd → Cobra Mine; 1986-02-27 to 1993-10-18; source msha-controller-operator-history
- **operator_operates_mine:** Dunkard Mining Company → Cobra Mine; 1986-03-14 to 1992-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Bow Valley Industries Ltd → Dunkard Mining Company; 1986-03-14 to 1992-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Dunkard Mining Company → Cobra Mine; 1992-06-23 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Joseph P  Tassone et al → Cobra Mine; 1992-06-23 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Joseph P  Tassone et al → Dunkard Mining Company; 1992-06-23 to 1997-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Dunkard Mining Company → Cobra Mine; 1997-11-01 to 2002-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Aloe Holding Inc → Cobra Mine; 1997-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aloe Holding Inc → Dunkard Mining Company; 1997-11-01 to 2002-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Cobra Mining LLC → Cobra Mine; 2002-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Kovach → Cobra Mine; 2002-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Kovach → Cobra Mining LLC; 2002-11-08 to current/open; source msha-controller-operator-history