# Relationship history for MSHA mine 4608998

Current hierarchy: **Charles William  Wright; Donald E  Trainer → F M C Services Inc → No 1 Surface Mine**

- 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:** F M C Services Inc → No 1 Surface Mine; 2003-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald E  Trainer  et al → No 1 Surface Mine; 2003-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald E  Trainer  et al → F M C Services Inc; 2003-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles William  Wright  et al → F M C Services Inc; 2003-07-14 to current/open; source msha-controller-operator-history