# Relationship history for MSHA mine 0500204

Current hierarchy: **William G Parfet Jr → George W Parfet Estate Inc → Rubey Standard 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

- **controller_controls_mine:** William G Parfet Jr → Rubey Standard Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H M Rubey Clay Company → Rubey Standard Mine; 1950-01-01 to 1980-11-09; source msha-controller-operator-history
- **controller_controls_mine:** George W Parfet Estate Inc-Ruby Heirs → Rubey Standard Mine; 1950-01-01 to 1980-11-09; source msha-controller-operator-history
- **controller_controls_operator:** George W Parfet Estate Inc-Ruby Heirs → H M Rubey Clay Company; 1950-01-01 to 1980-11-09; source msha-controller-operator-history
- **operator_operates_mine:** George W Parfet Estate Inc → Rubey Standard Mine; 1980-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William G Parfet Jr → George W Parfet Estate Inc; 1980-11-10 to current/open; source msha-controller-operator-history