# Relationship history for MSHA mine 3609715

Current hierarchy: **Harold  Litts → Litts & Son Stone Company → B & E Quarry**

- 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

- **controller_controls_mine:** Harold  Litts → B & E Quarry; 2008-07-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Litts & Son Stone Company → B & E Quarry; 2009-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Litts → Litts & Son Stone Company; 2009-03-13 to current/open; source msha-controller-operator-history