# Relationship history for MSHA mine 1002008

Current hierarchy: **Linda  Edstrom → Edstrom Construction → Cedar Rapids Crusher**

- 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

- **controller_controls_mine:** Linda  Edstrom → Cedar Rapids Crusher; 1992-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Edstrom Construction → Cedar Rapids Crusher; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linda  Edstrom → Edstrom Construction; 2001-08-01 to current/open; source msha-controller-operator-history