# Relationship history for MSHA mine 2902117

Current hierarchy: **Victoria S  Greenstreet → Sun Country Redi Mix → MAC #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

- **controller_controls_mine:** Cipriano L  Montoya → MAC #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montoya Sand & Gravel → MAC #1; 1993-09-01 to 1994-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Cipriano L  Montoya → Montoya Sand & Gravel; 1993-09-01 to 1994-09-06; source msha-controller-operator-history
- **operator_operates_mine:** Sun Country Concrete Inc → MAC #1; 1994-09-07 to 1997-09-29; source msha-controller-operator-history
- **controller_controls_mine:** Victoria S  Greenstreet → MAC #1; 1994-09-07 to 1997-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Victoria S  Greenstreet → Sun Country Concrete Inc; 1994-09-07 to 1997-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Montoya Sand & Gravel → MAC #1; 1997-09-30 to 1998-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Cipriano L  Montoya → Montoya Sand & Gravel; 1997-09-30 to 1998-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Sun Country Redi Mix → MAC #1; 1998-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Victoria S  Greenstreet → MAC #1; 1998-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victoria S  Greenstreet → Sun Country Redi Mix; 1998-02-03 to current/open; source msha-controller-operator-history