# Relationship history for MSHA mine 5100195

Current hierarchy: **Knife River Corporation → West Hawaii Concrete → Waimea Quarry**

- 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:** Carl  Simons → Waimea Quarry; 1980-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grace Pacific Corp → Waimea Quarry; 1984-04-17 to 2013-09-30; source msha-controller-operator-history
- **operator_operates_mine:** West Hawaii Concrete Ltd → Waimea Quarry; 1987-12-01 to 1988-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Simons → West Hawaii Concrete Ltd; 1987-12-01 to 1988-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Grace Pacific Corp → Waimea Quarry; 1988-08-17 to 1988-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Grace Pacific Corp → Grace Pacific Corp; 1988-08-17 to 1988-08-19; source msha-controller-operator-history
- **operator_operates_mine:** West Hawaii Concrete Ltd → Waimea Quarry; 1988-08-20 to 2001-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Simons → West Hawaii Concrete Ltd; 1988-08-20 to 2001-07-18; source msha-controller-operator-history
- **operator_operates_mine:** West Hawaii Concrete → Waimea Quarry; 2001-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Waimea Quarry; 2001-07-19 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → West Hawaii Concrete; 2001-07-19 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alexander & Baldwin Incorporated → Waimea Quarry; 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 1988-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Waimea Quarry; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → West Hawaii Concrete; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nan Inc → Waimea Quarry; 2023-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nan Inc → Grace Pacific Corp; 2023-11-15 to 1988-08-19; source msha-controller-operator-history