# Relationship history for MSHA mine 3002981

Current hierarchy: **Laura M  Szesnat; Richard P  Szesnat → CONSTANTINE CONSTRUCTION & FARM, INC. → BUTTON ROAD**

- 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:** John M Constantine → BUTTON ROAD; 1990-10-01 to 2000-04-13; source msha-controller-operator-history
- **controller_controls_mine:** John M  Constantine → BUTTON ROAD; 1990-10-01 to 2000-04-13; source msha-controller-operator-history
- **controller_controls_operator:** John M  Constantine → John M Constantine; 1990-10-01 to 2000-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Constantine Construction & Farm, Inc. → BUTTON ROAD; 2000-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Laura M  Szesnat  et al → BUTTON ROAD; 2000-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laura M  Szesnat  et al → Constantine Construction & Farm, Inc.; 2000-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard P  Szesnat  et al → Constantine Construction & Farm, Inc.; 2000-04-14 to current/open; source msha-controller-operator-history