# Relationship history for MSHA mine 4202495

Current hierarchy: **Terry  Messersmith → OAK CREEK ROCK PRODUCTS, LLC → OAK CREEK PORTABLE**

- 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:** TNT Trucking & Rock → OAK CREEK PORTABLE; 2008-04-24 to 2017-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Terry  Messersmith → OAK CREEK PORTABLE; 2008-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Messersmith → TNT Trucking & Rock; 2008-04-24 to 2017-05-31; source msha-controller-operator-history
- **operator_operates_mine:** OAK CREEK ROCK PRODUCTS, LLC → OAK CREEK PORTABLE; 2017-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry  Messersmith → OAK CREEK PORTABLE; 2017-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Messersmith → OAK CREEK ROCK PRODUCTS, LLC; 2017-06-01 to current/open; source msha-controller-operator-history