# Relationship history for MSHA mine 3604660

Current hierarchy: **Sinter Fuel Corp → Sinter Fuel Corp → Sinter Fuel Loading Dock**

- 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:** Sager Coal Company → Sinter Fuel Loading Dock; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Sager Coal Company → Sinter Fuel Loading Dock; 1950-01-01 to 1975-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Sager Coal Company → Sager Coal Company; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Sinter Fuel Corp → Sinter Fuel Loading Dock; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sinter Fuel Corp → Sinter Fuel Loading Dock; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sinter Fuel Corp → Sinter Fuel Corp; 1974-01-01 to current/open; source msha-controller-operator-history