# Relationship history for MSHA mine 4607536

Current hierarchy: **Maynard Don → C M Brier Corp → Dingess Rum No 1 Mine**

- 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:** U S Construction Company Inc → Dingess Rum No 1 Mine; 1988-06-01 to 1988-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Maplewood Mining Company Inc → Dingess Rum No 1 Mine; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maplewood Mining Company Inc → U S Construction Company Inc; 1988-06-01 to 1988-10-02; source msha-controller-operator-history
- **operator_operates_mine:** C M Brier Corp → Dingess Rum No 1 Mine; 1988-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maynard Don → Dingess Rum No 1 Mine; 1988-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maynard Don → C M Brier Corp; 1988-10-03 to current/open; source msha-controller-operator-history