# Relationship history for MSHA mine 0404781

Current hierarchy: **Ghilotti Mario → Ghilotti Brothers Construction → Water Shed 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:** Handley Margie → Water Shed Quarry; 1984-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hot Rocks Inc → Water Shed Quarry; 1985-10-01 to 1989-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Handley Margie → Hot Rocks Inc; 1985-10-01 to 1989-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Ghilotti Brothers Construction → Water Shed Quarry; 1989-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ghilotti Mario → Water Shed Quarry; 1989-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ghilotti Mario → Ghilotti Brothers Construction; 1989-08-15 to current/open; source msha-controller-operator-history