# Relationship history for MSHA mine 0404240

Current hierarchy: **David E  Crye → David Crye General Engineering Contractor, Inc. → Navajo Rock & Block**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Navajo Concrete Inc → Navajo Rock & Block; 1950-01-01 to 2012-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Albert A Lewis → Navajo Rock & Block; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert A Lewis → Navajo Concrete Inc; 1950-01-01 to 2012-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Papich Construction Company Inc → Navajo Rock & Block; 2012-10-01 to 2013-09-16; source msha-controller-operator-history
- **controller_controls_mine:** April  Papich et al → Navajo Rock & Block; 2012-10-01 to 2025-08-05; source msha-controller-operator-history
- **controller_controls_operator:** April  Papich et al → Papich Construction Company Inc; 2012-10-01 to 2013-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Papich et al → Papich Construction Company Inc; 2012-10-01 to 2013-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Navajo Concrete INC → Navajo Rock & Block; 2013-09-17 to 2020-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Albert A Lewis → Navajo Concrete INC; 2013-09-17 to 2020-02-29; source msha-controller-operator-history
- **controller_controls_mine:** David E  Crye → Navajo Rock & Block; 2015-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** David Crye General Engineering Contractor, Inc. → Navajo Rock & Block; 2020-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Crye → David Crye General Engineering Contractor, Inc.; 2020-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Granite Construction Inc → Navajo Rock & Block; 2025-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Papich Construction Company Inc; 2025-08-06 to 2013-09-16; source msha-controller-operator-history