# Relationship history for MSHA mine 4607235

Current hierarchy: **Dick J  Plaster → Lafayette Springs Enterprises Inc → Surface Mine No 1 (S)**

- 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:** Dick J  Plaster → Surface Mine No 1 (S); 1982-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafayette Springs Enterprises Inc → Surface Mine No 1 (S); 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dick J  Plaster → Lafayette Springs Enterprises Inc; 1986-12-01 to current/open; source msha-controller-operator-history