# Relationship history for MSHA mine 0404821

Current hierarchy: **Harvey Norman L Jr → Golden Portal Mining Inc → Hilda Mine**

- 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

- **operator_operates_mine:** Channel Mining Company Incorporatd → Hilda Mine; 1986-07-01 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Cameron Lorne A → Hilda Mine; 1986-07-01 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Cameron Lorne A → Channel Mining Company Incorporatd; 1986-07-01 to 1992-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Golden Portal Mining Inc → Hilda Mine; 1992-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harvey Norman L Jr → Hilda Mine; 1992-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harvey Norman L Jr → Golden Portal Mining Inc; 1992-04-20 to current/open; source msha-controller-operator-history