1927 Article Scientific Explanation Sound Waves Filtered Diagram Dr. GW SI1 TSC1 Please note that there is

Please note that there is slight bleed through on this ad from the print on the reverse

This is an original 1905 color print of an area of central London

This is an original 1943 black and white print ad for Marmon-Herrington of Indianapolis

There is a small light blemish in the top margin

1927 Article Scientific Explanation Sound Waves Filtered Diagram Dr. GW SI1 TSC1 Please note that there isThis is an original 1927 one page article (one single sided page) by Paul Welker on how sound waves are filtered. CONDITION This 84+ year old Item is rated Very Fine +++. Light aging throughout. Light creasing. No natural defects. Some light surface rub. No tears. No water damage. Please note there is print on the reverse, thus some bleed through may be present. Product Type: Original Print Article; Black White Grade: Very Fine +++ Dimensions: