# Relationship history for MSHA mine 2700497

Current hierarchy: **Charles  Benevento → On-Spec Sand & Gravel, LLC → On-Spec Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** On-Spec Sand & Gravel, LLC → On-Spec Sand & Gravel; 2015-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Ladd et al → On-Spec Sand & Gravel; 2015-12-21 to 2017-08-29; source msha-controller-operator-history
- **controller_controls_operator:** David  Ladd et al → On-Spec Sand & Gravel, LLC; 2015-12-21 to 2017-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Christopher J Bolton et al → On-Spec Sand & Gravel, LLC; 2015-12-21 to 2017-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Benevento → On-Spec Sand & Gravel; 2017-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Benevento → On-Spec Sand & Gravel, LLC; 2017-08-30 to current/open; source msha-controller-operator-history