# Relationship history for MSHA mine 4700754

Current hierarchy: **Janesville Sand & Gravel Company → Lycon Inc → LYCON, INC.**

- 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:** Sauk City Gravel Company → LYCON, INC.; 1950-01-01 to 1983-03-17; source msha-controller-operator-history
- **controller_controls_mine:** J F  Bushman → LYCON, INC.; 1950-01-01 to 1983-03-17; source msha-controller-operator-history
- **controller_controls_operator:** J F  Bushman → Sauk City Gravel Company; 1950-01-01 to 1983-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Lycon Inc → LYCON, INC.; 1983-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Janesville Sand & Gravel Company → LYCON, INC.; 1983-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janesville Sand & Gravel Company → Lycon Inc; 1983-03-18 to current/open; source msha-controller-operator-history