History
During the 1930’s both the tampon and menstrual cup became available
although neither were well received, woman continued to use the sanitary
napkin, possibly due to several reasons including the reticence of woman to
touch their genital area. Mrs Chalmers worked with several gynaecologists
over the 
years to produce the Tassette Menstrual Cup
which was first available in the 1930’s, although, did not increase in
popularity until the mid 1950’s when both she and Robert Oreck (with
whom she had joined forces) attempted to make it available to a larger
audience. Again it was not hugely successful.
There is also the question of the Daintette cup which may have been available prior to the introduction of the Tassette Cup however very little information is available. Today we have far greater choice with a number of cups on the market as well as other sanitary items. The Keeper was developed by The Keeper Incorporated during the 1980’s. The cup was initially developed by the manufacturer to give her daughters more choice and to assist in the reduction of the enormous quantities of sanitary waste. Ref The Museum of Menstruation and Women’s Health.