# Relationship history for MSHA mine 1102369

Current hierarchy: **Hocking Jack & Larry → Hocking Hocking & Kieffer Sand Company → Hocking Hocking & Kieffer Sand Company**

- 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:** Associated Materials Inc → Hocking Hocking & Kieffer Sand Company; 1950-01-01 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Alldredge E M → Hocking Hocking & Kieffer Sand Company; 1950-01-01 to 1987-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Alldredge E M → Associated Materials Inc; 1950-01-01 to 1980-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Hocking Hocking & Kieffer Sand Company → Hocking Hocking & Kieffer Sand Company; 1980-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hocking Jack & Larry → Hocking Hocking & Kieffer Sand Company; 1980-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hocking Jack & Larry → Hocking Hocking & Kieffer Sand Company; 1980-05-13 to current/open; source msha-controller-operator-history