# Relationship history for MSHA mine 5100040

Current hierarchy: **Nan Inc → Grace Pacific Corp → Waimanalo Quarry & Mill**

- 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:** Pacific Concrete & Rock Company Ltd → Waimanalo Quarry & Mill; 1950-01-01 to 1984-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Baker Hughes Inc → Waimanalo Quarry & Mill; 1950-01-01 to 1984-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Baker Hughes Inc → Pacific Concrete & Rock Company Ltd; 1950-01-01 to 1984-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Grace Pacific Corp → Waimanalo Quarry & Mill; 1984-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grace Pacific Corp → Waimanalo Quarry & Mill; 1984-04-17 to 2013-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Grace Pacific Corp → Grace Pacific Corp; 1984-04-17 to 2013-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Alexander & Baldwin Incorporated → Waimanalo Quarry & Mill; 2013-10-01 to 2023-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Alexander & Baldwin Incorporated → Grace Pacific Corp; 2013-10-01 to 2023-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Nan Inc → Waimanalo Quarry & Mill; 2023-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nan Inc → Grace Pacific Corp; 2023-11-15 to current/open; source msha-controller-operator-history