# Relationship history for MSHA mine 4404636

Current hierarchy: **Watson William H Jr & G W Mc Call Jr → Third Pocahontas Smokeless Coal Company → No 1 Mine**

- 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:** Third Pocahontas Smokeless Coal Company → No 1 Mine; 1977-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Watson William H Jr & G W Mc Call Jr → No 1 Mine; 1977-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Watson William H Jr & G W Mc Call Jr → Third Pocahontas Smokeless Coal Company; 1977-02-01 to current/open; source msha-controller-operator-history