# Relationship history for MSHA mine 0800932

Current hierarchy: **Rhoades Marvin & R H Purinton → P & R Shell Pit → P And R Shell Pit No 2**

- 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:** Rhoades Marvin & R H Purinton → P And R Shell Pit No 2; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P & R Shell Pit → P And R Shell Pit No 2; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhoades Marvin & R H Purinton → P & R Shell Pit; 1979-10-01 to current/open; source msha-controller-operator-history