# Relationship history for MSHA mine 5100137

Current hierarchy: **Ameron International Corp → Ameron H C & D → Olawalu Cinder Pit**

- 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:** Ameron International Corp → Olawalu Cinder Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hawaii Dept Of Land & Natural Resources → Olawalu Cinder Pit; 1950-01-01 to 1978-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Hawaii Dept Of Land & Natural Resources → Olawalu Cinder Pit; 1950-01-01 to 1978-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Hawaii Dept Of Land & Natural Resources → Hawaii Dept Of Land & Natural Resources; 1950-01-01 to 1978-12-18; source msha-controller-operator-history
- **operator_operates_mine:** Ameron H C & D → Olawalu Cinder Pit; 1978-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ameron International Corp → Ameron H C & D; 1978-12-19 to current/open; source msha-controller-operator-history