I am trying to find information on this question because i have to write a paper for school.
130625
You might try searching the various online patent resources.  I tried two different websites using the keywords "interference contrast microscope" and only got back patent references dating as far back as the years 1952 & 1953.\n\nHowever, when I narrowed down the keyword search to just "microscope," I was able to find all of the following U.S. Patents for the year 1935:\n\n1,987,776\n1,988,946\n1,989,691\n1,991,983\n1,991,997\n1,996,141\n1,998,216\n2,000,737\n2,003,387\n2,004,806\n2,013,422\n\nI hope I typed them out correctly for you.  \n\nNote:  I wasn't able to check each one to determine if any of them are directly related to the invention you're researching.\n\nAlso, unfortunately, just because the microscope you're looking for was invented in 1935 doesn't mean it was patented that same year.  Sorry!\n\nHope I've been of some help!
468941
I have some links which might be useful.\n\nGood luck
213524
The link may have info you can use.  Good luck.
90062
I hope this helps\nhttp://scholar.google.com/
160830
This is a great source... and if it's not in their database, they'll research it.\n\nGood luck
368397
try researching it here: http://wikipedia.org
55985
Try browsing in http://www.wikipedia.org/ or http://www.howstuffworks.com/
98844
I can provide a site that i found.\n\nHope it helps!
83454
Previous answer is good.  But Googling it would be slightly better.
576677
google it. or go to www. gov. org
57862
I would suggest that your best bet is to do a search on Yahoo! and you should find loads of information.
242142
Try looking on google or wikipedia.
450763
The link below may help. It has further links within it too.
592801
Have you tried going to wikipedia.com. That may help you with your search. They may have references and links to other places you can go if that's not enough info.
5827
The following site has the answer
264314
Have you tried www.wikipedia.com\ngood luck
666868
I would do a search using http://scholar.google.com/ as well as using any databases (such as EBSCO or ERIC) that might be available to you through your school.