# Relationship history for MSHA mine 4102853

Current hierarchy: **Briscoe K Parker Jr; Robert H Parker → Parker Brothers & Company Inc → I-45 Sand Plant No 318**

- 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:** Briscoe K Parker Jr et al → I-45 Sand Plant No 318; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Parker Brothers & Company Inc → I-45 Sand Plant No 318; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Briscoe K Parker Jr et al → Parker Brothers & Company Inc; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert H Parker et al → Parker Brothers & Company Inc; 1979-01-01 to current/open; source msha-controller-operator-history