# Relationship history for MSHA mine 0801294

Current hierarchy: **Michael J  Sadofski → Okeechobee Aggregrates, Inc. → Okeechobee Aggregates, 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:** Barnhill Enterprises Inc → Okeechobee Aggregates, Inc.; 2001-02-01 to 2001-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Wade D  Barnhill  et al → Okeechobee Aggregates, Inc.; 2001-02-01 to 2001-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Wade D  Barnhill  et al → Barnhill Enterprises Inc; 2001-02-01 to 2001-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Rock Sound Mining & Development → Okeechobee Aggregates, Inc.; 2001-05-18 to 2002-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Daniel C  Kessler Sr → Okeechobee Aggregates, Inc.; 2001-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C  Kessler Sr → Rock Sound Mining & Development; 2001-05-18 to 2002-07-07; source msha-controller-operator-history
- **operator_operates_mine:** Okeechobee Aggregrates, Inc. → Okeechobee Aggregates, Inc.; 2002-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael J  Sadofski → Okeechobee Aggregates, Inc.; 2002-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J  Sadofski → Okeechobee Aggregrates, Inc.; 2002-07-08 to current/open; source msha-controller-operator-history