# Relationship history for MSHA mine 5001898

Current hierarchy: **David C  Cruz → Cruz Construction Inc. → Cruz Grizzly 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Cook Inlet Regional Inc  et al → Cruz Grizzly Crusher; 2004-07-16 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** David C  Cruz → Cruz Grizzly Crusher; 2004-08-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alaska Interstate Construction, LLC. → Cruz Grizzly Crusher; 2008-08-01 to 2022-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Cook Inlet Regional Inc  et al → Alaska Interstate Construction, LLC.; 2008-08-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Nabors Industries Inc  et al → Alaska Interstate Construction, LLC.; 2008-08-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** David C  Cruz → Cruz Grizzly Crusher; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C  Cruz → Alaska Interstate Construction, LLC.; 2015-01-01 to 2022-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Cruz Construction Inc. → Cruz Grizzly Crusher; 2022-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C  Cruz → Cruz Construction Inc.; 2022-06-01 to current/open; source msha-controller-operator-history