# Relationship history for MSHA mine 0600604

Current hierarchy: **Rock Acquisition Limited Partnership → Fairfield Resources Management Inc → Fairfield Resources Management 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

- **controller_controls_mine:** Kenneth W  Kovacs → Fairfield Resources Management Inc; 1981-05-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dbd Inc → Fairfield Resources Management Inc; 1985-03-01 to 1988-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth W  Kovacs → Dbd Inc; 1985-03-01 to 1988-01-04; source msha-controller-operator-history
- **operator_operates_mine:** Fairfield Resources Inc → Fairfield Resources Management Inc; 1988-01-05 to 1991-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Alfred  Dube → Fairfield Resources Management Inc; 1988-01-05 to 1991-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Alfred  Dube → Fairfield Resources Inc; 1988-01-05 to 1991-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Fairfield Resources Management Inc → Fairfield Resources Management Inc; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rock Acquisition Limited Partnership → Fairfield Resources Management Inc; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rock Acquisition Limited Partnership → Fairfield Resources Management Inc; 1992-01-01 to current/open; source msha-controller-operator-history