There is one Birth Index (1906) at this time, and Death Indexes for each year from 1906 to 1961. Here is the Death Index list:
Unfortunately, this is not an easy search, but it is more than researchers have had until now. The site describes the process to obtain a non-certified death certificate:
* To apply for a non-certified copy you must first search the Pennsylvania birth indices or death indices to obtain a Pennsylvania State File number.
* Several years of indices (1920-1924 deaths and 1930-1951 deaths) are listed according to the Russell Soundex method of indexing.