Operating on-line marketplaces for sellers of goods and/or services in the field of industrial equipment, parts and supplies; providing an on-line marketplace exchange services, namely bartering of goods for others in the field of industrial equipment, parts and supplies; computerized on-line retail services in the field of industrial equipment, parts and supplies; auctioneering and industrial equipment, parts and supplies; promoting the goods and services of others by preparing and placing advertisements in an electronic magazine accesses through a global computer network dissemination of advertising for others in the field of industrial equipment, parts and supplies via the internet; and providing on-line information regarding the equipment, parts and supplies provided in connection with the above mentioned services