# Relationship history for MSHA mine 3304136

Current hierarchy: **Mark B  Stark → Nelson Stark Company → NELSON/STARK GRAVEL PIT**

- 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:** C Carmical Sand & Gravel Company → NELSON/STARK GRAVEL PIT; 1988-05-01 to 1992-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Carmical Claude C → NELSON/STARK GRAVEL PIT; 1988-05-01 to 1992-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Carmical Claude C → C Carmical Sand & Gravel Company; 1988-05-01 to 1992-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Nelson Stark Company → NELSON/STARK GRAVEL PIT; 1992-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark B  Stark → NELSON/STARK GRAVEL PIT; 1992-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark B  Stark → Nelson Stark Company; 1992-08-25 to current/open; source msha-controller-operator-history