# Relationship history for MSHA mine 2402228

Current hierarchy: **Brad  Mercord; Bill  Carter → Montana Rockworks LLP → ACM 55 & 58 MILE**

- 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:** Bill  Carter et al → ACM 55 & 58 MILE; 2001-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montana Rockworks LLP → ACM 55 & 58 MILE; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Carter et al → Montana Rockworks LLP; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Mercord et al → Montana Rockworks LLP; 2001-09-01 to current/open; source msha-controller-operator-history