# Relationship history for MSHA mine 0405780

Current hierarchy: **Albert L Folchi; Carol J Folchi → Folchi Logging & Construction Inc → Roberti Ranch**

- 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:** Valley Materials & Equipment → Roberti Ranch; 2009-03-26 to 2015-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert T  Tonini → Roberti Ranch; 2009-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert T  Tonini → Valley Materials & Equipment; 2009-03-26 to 2015-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Folchi Logging & Construction Inc → Roberti Ranch; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert L Folchi et al → Roberti Ranch; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert L Folchi et al → Folchi Logging & Construction Inc; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carol J Folchi et al → Folchi Logging & Construction Inc; 2015-07-01 to current/open; source msha-controller-operator-history