# Relationship history for MSHA mine 5100183

Current hierarchy: **Felton Glen → Hamakua Gravel Inc → Hamakua Gravel Incorporated**

- 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 Equipment Rental & Sales Inc → Hamakua Gravel Incorporated; 1950-01-01 to 1985-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Lirou Al → Hamakua Gravel Incorporated; 1950-01-01 to 1985-02-18; source msha-controller-operator-history
- **controller_controls_operator:** Lirou Al → Pacific Equipment Rental & Sales Inc; 1950-01-01 to 1985-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Hamakua Gravel Inc → Hamakua Gravel Incorporated; 1985-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Felton Glen Et Al → Hamakua Gravel Incorporated; 1985-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Felton Glen Et Al → Hamakua Gravel Inc; 1985-02-19 to current/open; source msha-controller-operator-history