The National Council on Compensation Insurance is a group of insurance companies that shares workers' compensation information. The NCCI collects data on workers' compensation claims and policies and uses the information for workers' compensation insurance rate recommendations. The NCCI became operational in 1923 and exists to this day. Here is some Workmen's Compensation Experience data compiled by the NCCI in 1925 as to the classifications asbestos goods manufacturing and asbestos-spinning.
Some members of the NCCI in 1933 included Aetna Life Insurance Company, Continental Casualty Company, Fireman's Fund Indemnity Company, Hartford Accident & Indemnity Company, Liberty Mutual Insurance Company, Pacific Indemnity Company, and Sun Indemnity Company (now known as Chubb Indemnity Insurance Company). The latter two members are currently part of the Chubb Group of Insurance Companies. In a 1933 report, the NCCI stated that they had "perfected the Occupational Disease programme, noted in the report of last year as having been begun." Here is the NCCI's 1933 table of occupational disease rates, which includes asbestosis, silicosis, and benzol (benzene).