Although it sells all of the telephones that it produces, Mammoth Industries' share of all telephone sales has declined over the last year.

Mammoth Industries' average inventory of telephones awaiting shipment to retailers has declined slightly over the last year.

Advertising has made the brand name of Mammoth Industries' telephones widely known, but few consumers know that Mammoth Industries owns this brand.

Mammoth Industries' telephone is one of three brands of telephone that have together accounted for the bulk of the last year's increase in sales.

Despite a slight decline in the retail price, sales of Mammoth Industries' telephones have fallen in the last year.