# Relationship history for MSHA mine 3608036

Current hierarchy: **Waste Management Inc → Wheelabrator Fuel Services Inc → Frackville Culm Blending Plant**

- 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:** Morea Services Inc → Frackville Culm Blending Plant; 1988-08-01 to 1990-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Pagnotti Enterprises Inc → Frackville Culm Blending Plant; 1988-08-01 to 1990-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Pagnotti Enterprises Inc → Morea Services Inc; 1988-08-01 to 1990-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Wheelabrator Fuel Services Inc → Frackville Culm Blending Plant; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Waste Management Inc → Frackville Culm Blending Plant; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waste Management Inc → Wheelabrator Fuel Services Inc; 1990-07-01 to current/open; source msha-controller-operator-history