# Relationship history for MSHA mine 4105021

Current hierarchy: **Roland H  Beck; James R  Gumm → B & G MATERIALS, LLC → BG006**

- 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:** James R  Gumm  et al → BG006; 2003-07-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & G MATERIALS, LLC → BG006; 2013-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Gumm  et al → B & G MATERIALS, LLC; 2013-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roland H  Beck  et al → B & G MATERIALS, LLC; 2013-07-01 to current/open; source msha-controller-operator-history