# Relationship history for MSHA mine 5001770

Current hierarchy: **David C  Cruz → Cruz Construction → Ekuk Rock 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:** Lynden Inc → Ekuk Rock Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Buchholz → Ekuk Rock Crusher; 2002-06-30 to 2004-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Ekuk Rock Products L.L.C. → Ekuk Rock Crusher; 2003-04-01 to 2010-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Buchholz → Ekuk Rock Products L.L.C.; 2003-04-01 to 2004-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Heyano → Ekuk Rock Crusher; 2004-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Heyano → Ekuk Rock Products L.L.C.; 2004-06-17 to 2010-07-27; source msha-controller-operator-history
- **controller_controls_mine:** David C  Cruz → Ekuk Rock Crusher; 2004-08-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knik Construction Co., Inc. → Ekuk Rock Crusher; 2010-07-28 to 2017-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Lynden Inc → Knik Construction Co., Inc.; 2010-07-28 to 2017-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Cruz Construction → Ekuk Rock Crusher; 2017-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C  Cruz → Cruz Construction; 2017-03-14 to current/open; source msha-controller-operator-history