# Relationship history for MSHA mine 4404277

Current hierarchy: **F B  Nutter Sr → Virginia Limestone Corp → Surface No 1**

- 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:** Virginia Limestone Corp → Surface No 1; 1976-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** F B  Nutter Sr → Surface No 1; 1976-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** F B  Nutter Sr → Virginia Limestone Corp; 1976-02-23 to current/open; source msha-controller-operator-history