# Relationship history for MSHA mine 0103483

Current hierarchy: **Edward J  Serda → Mobile Abrasives Inc. → Mobile Abrasives Inc.**

- 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:** Edward J  Serda → Mobile Abrasives Inc.; 2002-03-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Abrasives Inc. → Mobile Abrasives Inc.; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward J  Serda → Mobile Abrasives Inc.; 2015-01-01 to current/open; source msha-controller-operator-history