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Development of automatic checkweighing machines of which approved models are now available; such machines can be used successfully in weight-control schemes designed to protect packer from producing underweights and, where possible, to prevent excessive overpack; however, installation of checkweighing machine does not automatically guarantee success; some of problems involved and factors -- such as weight distribution from filling machines -- which have to be considered in determining where and how automatic checkweighers can be usefully applied; review of recent developments is included. (Wrapping and Packing by Machines)