# Relationship history for MSHA mine 4103960

Current hierarchy: **Clark  Hamilton; Kip A  Hamilton → Superior Sand & Rock → SUPERIOR SAND & ROCK**

- 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:** Vance Sand & Rock Inc → SUPERIOR SAND & ROCK; 1997-01-01 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Presley → SUPERIOR SAND & ROCK; 1997-01-01 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Presley → Vance Sand & Rock Inc; 1997-01-01 to 1998-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Superior Sand & Rock → SUPERIOR SAND & ROCK; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clark  Hamilton et al → SUPERIOR SAND & ROCK; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clark  Hamilton et al → Superior Sand & Rock; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kip A  Hamilton et al → Superior Sand & Rock; 1998-05-01 to current/open; source msha-controller-operator-history