# Relationship history for MSHA mine 3607805

Current hierarchy: **John W  Rich Jr → Waste Management & Processors Inc → W M P I**

- 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

- **operator_operates_mine:** Waste Management & Processors Inc → W M P I; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John W  Rich Jr et al → W M P I; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Rich Jr et al → Waste Management & Processors Inc; 1986-05-01 to current/open; source msha-controller-operator-history