# Relationship history for MSHA mine 3607895

Current hierarchy: **Charles Kevin Will; Deborah Afton Will → A C A Sand and Gravel LLC → A C A Sand and Gravel LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Roger E Niemeyer Sr → A C A Sand and Gravel LLC; 1985-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rodger E Niemeyer Sr → A C A Sand and Gravel LLC; 1987-06-01 to 2006-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Roger E Niemeyer Sr → Rodger E Niemeyer Sr; 1987-06-01 to 2006-06-07; source msha-controller-operator-history
- **operator_operates_mine:** A C A Sand and Gravel LLC → A C A Sand and Gravel LLC; 2006-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cory D  Rose  et al → A C A Sand and Gravel LLC; 2006-06-08 to 2016-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Cory D  Rose  et al → A C A Sand and Gravel LLC; 2006-06-08 to 2016-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Anne K  Zawacki  et al → A C A Sand and Gravel LLC; 2006-06-08 to 2016-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Alex D  Zawacki  et al → A C A Sand and Gravel LLC; 2006-06-08 to 2016-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Deborah Afton Will et al → A C A Sand and Gravel LLC; 2016-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deborah Afton Will et al → A C A Sand and Gravel LLC; 2016-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles Kevin Will et al → A C A Sand and Gravel LLC; 2016-05-18 to current/open; source msha-controller-operator-history