# Relationship history for MSHA mine 2302351

Current hierarchy: **Joshua M Garrison → Martin Sand & Gravel → Martin Construction**

- 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:** Martin Construction → Martin Construction; 2006-11-27 to 2016-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Jerry D  Martin → Martin Construction; 2006-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry D  Martin → Martin Construction; 2006-11-27 to 2016-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Martin Sand & Gravel → Martin Construction; 2016-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joshua M Garrison → Martin Construction; 2016-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joshua M Garrison → Martin Sand & Gravel; 2016-04-01 to current/open; source msha-controller-operator-history