The RP-706 looks like it was released in 1958 after the Hoffman P411 in 1957.
| Company | Hoffman Electronics Corp. |
| Year | 1958 |
| Cell Type | Product |
| Part No. | RP-706 |
| Primary Use | Consumer, |
| Materials | silicon, plastic |
| Acquired | Purchased |
Popular Electronics Magazine with the RP-706 on the front cover
https://www.americanradiohistory.com/Archive-Poptronics/50s/59/Pop-1959-01.pdf
