It is not known if other lock manufacturers plan to follow suit.
One model already available from General Electric costs about $900, and other manufacturers plan to offer similar appliances.
And European manufacturers plan to offer more affordable models within the next few years.
Television set manufacturers and computer makers plan to start delivering the machines by the spring of 1998.
Some manufacturers plan to charge $10 to $20 a month to listen for their signals.
Several manufacturers plan to introduce the phones over the next year at prices under $200.
Three other manufacturers are not planning to make additional influenza vaccine this season.
How are manufacturers planning to produce even better fuel efficiency?
Several manufacturers plan to have machines on the market by fall at prices that haven't been announced but are said to run from $500 to $600.
Several manufacturers are planning to announce products that will work with the iPod to move music to devices around the house.