# Relationship history for MSHA mine 4300456

Current hierarchy: **Estate of Lawrence E White → Lawrence White Construction → Portable Crushing**

- 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:** Lawrence White Construction → Portable Crushing; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence  White → Portable Crushing; 1990-05-01 to 2015-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  White → Lawrence White Construction; 1990-05-01 to 2015-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Estate of Lawrence E White → Portable Crushing; 2015-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Lawrence E White → Lawrence White Construction; 2015-04-24 to current/open; source msha-controller-operator-history