# Relationship history for MSHA mine 4605737

Current hierarchy: **Peggy  Brown → Viking Resources Inc → Viking #1**

- 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:** Hemco Coal Management Corp → Viking #1; 1978-03-01 to 1988-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Cannon Herbert S & Company Limited → Viking #1; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cannon Herbert S & Company Limited → Hemco Coal Management Corp; 1978-03-01 to 1988-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Tiffany Mining Inc → Viking #1; 1988-08-30 to 1996-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Lawyer Jr → Viking #1; 1988-08-30 to 1996-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Lawyer Jr → Tiffany Mining Inc; 1988-08-30 to 1996-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Tiffany Mining Inc → Viking #1; 1996-02-22 to 1996-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Holbrook → Viking #1; 1996-02-22 to 1996-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Holbrook → Tiffany Mining Inc; 1996-02-22 to 1996-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Tiffany Mining Inc → Viking #1; 1996-10-02 to 1998-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Ellis Norman P → Viking #1; 1996-10-02 to 1998-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Ellis Norman P → Tiffany Mining Inc; 1996-10-02 to 1998-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Acme Leasing Inc → Viking #1; 1998-02-03 to 2000-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Lowell R  Grimmett → Viking #1; 1998-02-03 to 2000-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Lowell R  Grimmett → Acme Leasing Inc; 1998-02-03 to 2000-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Viking Resources Inc → Viking #1; 2000-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peggy  Brown → Viking #1; 2000-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peggy  Brown → Viking Resources Inc; 2000-03-03 to current/open; source msha-controller-operator-history