# Relationship history for MSHA mine 3100491

Current hierarchy: **Walter F  Rose Jr → Rose Brothers Paving Company, Inc. → 1997 Power Screen 615 Trammel (Company Number M103**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** A C Martin & Company Inc → 1997 Power Screen 615 Trammel (Company N; 1950-01-01 to 1984-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Danny Keith  Martin → 1997 Power Screen 615 Trammel (Company N; 1950-01-01 to 1984-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Danny Keith  Martin → A C Martin & Company Inc; 1950-01-01 to 1984-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Twenty-Twenty Corp → 1997 Power Screen 615 Trammel (Company N; 1984-04-02 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_mine:** William A  Dunn → 1997 Power Screen 615 Trammel (Company N; 1984-04-02 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_operator:** William A  Dunn → Twenty-Twenty Corp; 1984-04-02 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Walter F  Rose Jr → 1997 Power Screen 615 Trammel (Company N; 1985-01-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Twenty-Twenty Sand Corp → 1997 Power Screen 615 Trammel (Company N; 1988-01-01 to 2010-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Walter F  Rose Jr → 1997 Power Screen 615 Trammel (Company N; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter F  Rose Jr → Twenty-Twenty Sand Corp; 1988-01-01 to 2010-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Rose Brothers Paving Company, Inc. → 1997 Power Screen 615 Trammel (Company N; 2010-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter F  Rose Jr → Rose Brothers Paving Company, Inc.; 2010-01-14 to current/open; source msha-controller-operator-history