# Relationship history for MSHA mine 2602030

Current hierarchy: **Floyd A  Meldrum → Boulder Sand & Gravel, Inc. → Speedway**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** American Sand & Gravel Llc → Speedway; 1987-09-01 to 2006-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Aristotle  Melonas → Speedway; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aristotle  Melonas → American Sand & Gravel Llc; 1987-09-01 to 2006-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Judy  Jensen → Speedway; 1997-04-22 to 2011-12-22; source msha-controller-operator-history
- **operator_operates_mine:** American Sand & Gravel Ltd → Speedway; 2006-02-01 to 2011-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey P  Schaffer → Speedway; 2006-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey P  Schaffer → American Sand & Gravel Ltd; 2006-02-01 to 2011-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Boulder Sand & Gravel, Inc. → Speedway; 2011-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Floyd A  Meldrum → Speedway; 2011-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Floyd A  Meldrum → Boulder Sand & Gravel, Inc.; 2011-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Judy  Jensen → Boulder Sand & Gravel, Inc.; 2011-12-23 to 2011-12-22; source msha-controller-operator-history