# Relationship history for MSHA mine 2902247

Current hierarchy: **Dale W  Long → D & M Aggregate Service Inc. → D & M Portable Crusher #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** D & M Aggregate Service Inc. → D & M Portable Crusher #1; 2003-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dale W  Long et al → D & M Portable Crusher #1; 2003-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale W  Long et al → D & M Aggregate Service Inc.; 2003-03-03 to current/open; source msha-controller-operator-history