# Relationship history for MSHA mine 5500008

Current hierarchy: **B&J Holdings I LLC → Heavy Materials LLC → Brookman Quarry**

- 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:** V I Cement & Building Products → Brookman Quarry; 1978-03-09 to 2005-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Devcon International Inc → Brookman Quarry; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Devcon International Inc → V I Cement & Building Products; 1978-03-09 to 2005-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Heavy Materials LLC → Brookman Quarry; 2005-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas B  Brunt IV  et al → Brookman Quarry; 2005-10-01 to 2015-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Thomas B  Brunt IV  et al → Heavy Materials LLC; 2005-10-01 to 2015-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Douglas J  Gurlea  et al → Heavy Materials LLC; 2005-10-01 to 2015-10-26; source msha-controller-operator-history
- **controller_controls_mine:** US Concrete → Brookman Quarry; 2015-10-27 to 2026-05-14; source msha-controller-operator-history
- **controller_controls_operator:** US Concrete → Heavy Materials LLC; 2015-10-27 to 2026-05-14; source msha-controller-operator-history
- **controller_controls_mine:** B&J Holdings I LLC → Brookman Quarry; 2026-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B&J Holdings I LLC → Heavy Materials LLC; 2026-05-15 to current/open; source msha-controller-operator-history