# Relationship history for MSHA mine 3609249

Current hierarchy: **Lance  Birchard → L & D Stoneworks Inc → L & D Stoneworks Middletown Quarry**

- 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:** L & D Stoneworks Inc → L & D Stoneworks Middletown Quarry; 2004-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lance  Birchard et al → L & D Stoneworks Middletown Quarry; 2004-04-20 to 2024-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Lance  Birchard et al → L & D Stoneworks Inc; 2004-04-20 to 2024-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Owen et al → L & D Stoneworks Inc; 2004-04-20 to 2024-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Lance  Birchard → L & D Stoneworks Middletown Quarry; 2024-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lance  Birchard → L & D Stoneworks Inc; 2024-01-04 to current/open; source msha-controller-operator-history