# Relationship history for MSHA mine 0404815

Current hierarchy: **Prock P Eldon → Zodiac Investment Inc → Zodiac**

- 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:** Victory Industrial Pozzolan Inc → Zodiac; 1986-06-01 to 1989-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Hoover David E → Zodiac; 1986-06-01 to 1989-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Hoover David E → Victory Industrial Pozzolan Inc; 1986-06-01 to 1989-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Zodiac Investment Inc → Zodiac; 1989-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Prock P Eldon → Zodiac; 1989-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Prock P Eldon → Zodiac Investment Inc; 1989-08-30 to current/open; source msha-controller-operator-history