# Relationship history for MSHA mine 4403936

Current hierarchy: **Taylor K D Ii → J & K Coal Co → Surface Mines No 4 & 5**

- 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:** J & K Coal Co → Surface Mines No 4 & 5; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor K D Ii → Surface Mines No 4 & 5; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor K D Ii → J & K Coal Co; 1950-01-01 to current/open; source msha-controller-operator-history