# Relationship history for MSHA mine 3304088

Current hierarchy: **Miller Daniel O → Sugarcreek Clay & Limestone Inc → Hershberger 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:** Sugarcreek Clay & Limestone → Hershberger Strip; 1987-03-01 to 1988-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Wenger Leonard → Hershberger Strip; 1987-03-01 to 1988-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Wenger Leonard → Sugarcreek Clay & Limestone; 1987-03-01 to 1988-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Sugarcreek Clay & Limestone Inc → Hershberger Strip; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Miller Daniel O → Hershberger Strip; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Miller Daniel O → Sugarcreek Clay & Limestone Inc; 1988-05-01 to current/open; source msha-controller-operator-history