# Relationship history for MSHA mine 3605454

Current hierarchy: **Moser Jack Jr → Brownstown Construction Company → Brownstown Strip**

- 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:** Roger E Gerhart Inc → Brownstown Strip; 1975-02-16 to 1976-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Gerhart Roger E → Brownstown Strip; 1975-02-16 to 1976-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Gerhart Roger E → Roger E Gerhart Inc; 1975-02-16 to 1976-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Brownstown Construction Company → Brownstown Strip; 1976-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Moser Jack Jr → Brownstown Strip; 1976-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moser Jack Jr → Brownstown Construction Company; 1976-03-30 to current/open; source msha-controller-operator-history