# Relationship history for MSHA mine 4608570

Current hierarchy: **Richard H  Abraham → Rio Group, Inc. → Coalburg No 2 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:** Falcon Land Company Inc → Coalburg No 2 Mine; 1996-05-01 to 1996-07-18; source msha-controller-operator-history
- **controller_controls_mine:** William D  Abraham → Coalburg No 2 Mine; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William D  Abraham → Falcon Land Company Inc; 1996-05-01 to 1996-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Sparta Corp → Coalburg No 2 Mine; 1996-07-19 to 1998-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Herndon David N → Coalburg No 2 Mine; 1996-07-19 to 1998-12-07; source msha-controller-operator-history
- **controller_controls_operator:** Herndon David N → Sparta Corp; 1996-07-19 to 1998-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Falcon Land Company Inc → Coalburg No 2 Mine; 1998-12-08 to 2003-09-04; source msha-controller-operator-history
- **controller_controls_operator:** William D  Abraham → Falcon Land Company Inc; 1998-12-08 to 2003-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Lewis et al → Coalburg No 2 Mine; 2000-10-01 to 2006-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Rio Group, Inc. → Coalburg No 2 Mine; 2003-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Lewis et al → Rio Group, Inc.; 2003-09-05 to 2006-10-01; source msha-controller-operator-history
- **controller_controls_operator:** William B  Brown Jr et al → Rio Group, Inc.; 2003-09-05 to 2006-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Richard H  Abraham et al → Coalburg No 2 Mine; 2006-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Abraham et al → Rio Group, Inc.; 2006-10-02 to current/open; source msha-controller-operator-history