71.   Similar though they are in concept, however, the two rival machines have extremely different specs, which may make a buying decision even more difficult.

72.   Some machines have see-through hoses that make spotting obstructions easy.

73.   Some analog machines do have recirculating feeders that can keep sending a multipage document through, but they are prone to paper jams.

74.   Some IBM machines also have voice command controls so that certain functions, such as opening a file, can be accomplished by a spoken command.

75.   Some machines even have racks for many colored spools of thread.

76.   Snowmobiles produce both noise and exhaust emissions, and the machines have numerous foes who want them banned from national parks and other locations.

77.   Some new telephone-answering machines have quick-playback buttons, for when your callers drone on and on with their shaggy-dog messages.

78.   Still, the machine has its drawbacks.

79.   That allowed machines to have more dazzling features, like digital scoring, speech and synchronized light shows.