# Relationship history for MSHA mine 4104764

Current hierarchy: **B & B Solvent Holdings Inc; Adam  Ibarra → B & B Solvent LTD → Portable #1**

- 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:** B & B Solvent LTD → Portable #1; 2008-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tam  Terry et al → Portable #1; 2008-12-03 to 2015-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Tam  Terry et al → B & B Solvent LTD; 2008-12-03 to 2015-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Adam  Ibarra et al → Portable #1; 2015-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam  Ibarra et al → B & B Solvent LTD; 2015-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B & B Solvent Holdings Inc et al → B & B Solvent LTD; 2015-01-20 to current/open; source msha-controller-operator-history