vice by which chalk marks may be rubbed off from boards without the aid of moisture the invention also serving as an excellent device for rubbing and cleaninggthe glass of windows mirrors interlocked or connected together to form one or more layers or bot tially as shown and described. [The object of thisinvention into obtain a spring or elastic bed bottom of simple construction which will be more flexible than those hither mattress or bed.], scientific american, 1861-11-30
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