As the letterhead on the main page unquestionably demonstrates, Rotograph took over the National Art Views company (in 1904) and apparently continued to use that company's plates, printing some of the same cards and later issuing the same views in different styles such as hand colored.  This practice can be determined from identical views and similar features in the work issued by both companies and from the common numbering system for National Art and Rotograph cards, such as No. 3 and A 3, Grant's tomb. 

              Rotograph A 3

Additionally, at least one card, NAV 2783, carries Rotograph advertising on the reverse.

          The card below takes the history a step further: though the typeface resembles NAV cards, all mention of that company has disappeared and the back advertises offices and salespersons for Rotograph.  According to the letterhead, this 164th street address was the location of the factory.

   The Phoenix Wheel, Celoron Park, Lake Chautaqua, Jamestown, NY

              Back of Same            

     Some later company advertising cards carry not only names and signatures of company personnel, but an occasional face.  Here (thanks to one alert contributor and collector of Rotograph lighthouses) is Mr. Louis Kaufman:

The card announces that Kaufman will be visiting the merchant on approximately the date listed to display the quality views of this publisher.  Many cards with typed or printed company messages are to be found today.  For instance,   this one.

         Virginia Faulkner reported in 1977 having seen National Art Views numbers as high as 2880.  Rotograph issued cards into the 60,000's, but not as a continuous run.  However, the matter of quantity is difficult, because the company often did several of the same view in different series; for instance, #3067 and G14b, both in color, show Grant's tomb from the same angle and with the same pedestrians crossing the street.  However, G10a, showing the same monument from the same angle, has a motor car and different shading.  The company also inserted cards into a series with a subseries numbering or lettering system. As if that were not enough, there are many cards with different views assigned the same number, such as A76a, Hamilton's Grave, and A76a, The Little Church around the Corner, both New York City.  See  the Additional Information link on the Main Page as well as various Excel files.

           Rotograph stopped applying for copyrights in 1911.  We know from some of the novelty cards that they persisted until at least 1908, as calendar cards for that year attest.  The William Howard Taft presidential card shown below may have been published after Taft's election in 1908, possibly after his inauguration in 1909.  Except that it is divided back, the card itself does not give any other clue.  

Possibly in the 'B' series.  No number given.

The company may have continued, but apparently it did not do so as a publisher of postcards.  "Bromide" paper was a trademark for many of their RP cards, and it may be that they were selling photographic paper before and after their venture into postcard publishing.    

Bromide paper advertisement.

          The company sent out work to printers in the United States, England, and Germany, and perhaps elsewhere.  As is noted in Geary and Webb's book, Delivering Views, it happened that camera technology and printing technology were at a high point in Germany during this time, and some of the best postcard lithography was being done there.  Rotograph relied upon the printing firms of Stengel (in Dresden) and of Knackstedt & Nather (in Hamburg).  Stengel printed the fine art reproductions issued by Rotograph, for instance, and Knackstedt some of its quality views series.  It is noteworthy that a Ludwig Knackstedt is listed on the letterhead as one of the Vice Presidents.