# Relationship history for MSHA mine 0504788

Current hierarchy: **Shauna  Beltramo; Timothy J Beltramo → Tony J  Beltramo & Sons, Inc. → Portable Screening Plant**

- 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:** Robert D  Beltramo  et al → Portable Screening Plant; 1983-07-01 to 2014-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Tony J  Beltramo & Sons, Inc. → Portable Screening Plant; 2004-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  Beltramo  et al → Tony J  Beltramo & Sons, Inc.; 2004-01-26 to 2014-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Joseph A  Beltramo  et al → Tony J  Beltramo & Sons, Inc.; 2004-01-26 to 2014-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Timothy J Beltramo et al → Portable Screening Plant; 2014-08-29 to 2020-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Timothy J Beltramo et al → Tony J  Beltramo & Sons, Inc.; 2014-08-29 to 2020-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Robert D Beltramo et al → Tony J  Beltramo & Sons, Inc.; 2014-08-29 to 2020-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Timothy J Beltramo et al → Portable Screening Plant; 2020-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy J Beltramo et al → Tony J  Beltramo & Sons, Inc.; 2020-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shauna  Beltramo et al → Tony J  Beltramo & Sons, Inc.; 2020-01-25 to current/open; source msha-controller-operator-history