# Relationship history for MSHA mine 3301950

Current hierarchy: **Harold B  Epler Jr → General Clay Products Corp → Diamond Div No 2 Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Glen Gery Corp → Diamond Div No 2 Plant; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Glen-Gery Corp → Diamond Div No 2 Plant; 1950-01-01 to 1981-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Glen-Gery Corp → Glen Gery Corp; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Harold B  Epler Jr → Diamond Div No 2 Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** General Clay Products Corp → Diamond Div No 2 Plant; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold B  Epler Jr → General Clay Products Corp; 1978-12-01 to current/open; source msha-controller-operator-history