# Relationship history for MSHA mine 3610369

Current hierarchy: **William  Newell → Cambridge Natural Stone → Cambridge Location**

- 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:** Cambridge Natural Stone → Cambridge Location; 2021-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Newell → Cambridge Location; 2021-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Newell → Cambridge Natural Stone; 2021-07-26 to current/open; source msha-controller-operator-history