# Relationship history for MSHA mine 5001459

Current hierarchy: **Granite Construction Inc → Granite Construction Company → #1 Portable 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Granite Construction Inc → #1 Portable Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald M  March et al → #1 Portable Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wilder Construction Company → #1 Portable Crusher; 1984-03-01 to 2008-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Donald M  March et al → Wilder Construction Company; 1984-03-01 to 2008-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → #1 Portable Crusher; 2008-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 2008-04-04 to current/open; source msha-controller-operator-history