# Relationship history for MSHA mine 4105102

Current hierarchy: **Walker M.  Schmidt → Schmidt Land Services Inc → Parsons Pit**

- 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:** Walker M.  Schmidt → Parsons Pit; 2012-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schmidt Land Services Inc → Parsons Pit; 2014-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker M.  Schmidt → Schmidt Land Services Inc; 2014-12-04 to current/open; source msha-controller-operator-history