# Relationship history for MSHA mine 3304726

Current hierarchy: **Richard  Welsh → Miami Valley Topsoil → Miami Valley Topsoil**

- 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:** Miami Valley Topsoil → Miami Valley Topsoil; 2016-02-22 to 2018-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Welsh et al → Miami Valley Topsoil; 2016-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Welsh et al → Miami Valley Topsoil; 2016-02-22 to 2018-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Rodney  Watson et al → Miami Valley Topsoil; 2016-02-22 to 2018-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Miami Valley Topsoil → Miami Valley Topsoil; 2018-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Welsh → Miami Valley Topsoil; 2018-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Welsh → Miami Valley Topsoil; 2018-04-30 to current/open; source msha-controller-operator-history