# Relationship history for MSHA mine 0405066

Current hierarchy: **Donald J Plyley → Philadelphia Recycling Mine → PHILADELPHIA RECYCLING 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Philadelphia Recycling Mine → PHILADELPHIA RECYCLING MINE; 1989-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald J Plyley → PHILADELPHIA RECYCLING MINE; 1989-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald J Plyley → Philadelphia Recycling Mine; 1989-12-01 to current/open; source msha-controller-operator-history