# Relationship history for MSHA mine 1700614

Current hierarchy: **London William W → William W London & Son → WILLIAM W. LONDON & SON**

- 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:** William W London & Son → WILLIAM W. LONDON & SON; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** London William W → WILLIAM W. LONDON & SON; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** London William W → William W London & Son; 1993-05-01 to current/open; source msha-controller-operator-history