# Relationship history for MSHA mine 1510622

Current hierarchy: **Jackson J Michael → St Helens Processing Inc → R B S Plant No 3**

- 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

- **controller_controls_mine:** Schweitzer Roy B → R B S Plant No 3; 1976-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Euclid Energy Inc → R B S Plant No 3; 1976-11-01 to 1977-11-27; source msha-controller-operator-history
- **controller_controls_mine:** Comer Robert W → R B S Plant No 3; 1976-11-01 to 1977-11-27; source msha-controller-operator-history
- **controller_controls_operator:** Comer Robert W → Euclid Energy Inc; 1976-11-01 to 1977-11-27; source msha-controller-operator-history
- **operator_operates_mine:** R B S Inc → R B S Plant No 3; 1977-11-28 to 1986-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Schweitzer Roy B → R B S Inc; 1977-11-28 to 1986-07-16; source msha-controller-operator-history
- **operator_operates_mine:** St Helens Processing Inc → R B S Plant No 3; 1986-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jackson J Michael → R B S Plant No 3; 1986-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jackson J Michael → St Helens Processing Inc; 1986-07-17 to current/open; source msha-controller-operator-history